diff --git "a/position_layouts_all.json" "b/position_layouts_all.json"
new file mode 100644--- /dev/null
+++ "b/position_layouts_all.json"
@@ -0,0 +1,15362 @@
+[
+  {
+    "file_name": "position_boundary_4_banana_iter0.png",
+    "id": 1440,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      5760,
+      5761,
+      5762,
+      5763
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_banana_iter0.png",
+    "id": 1441,
+    "count": 5,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      5764,
+      5765,
+      5766,
+      5767,
+      5768
+    ],
+    "caption": "a photo of 5 bananas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_traffic light_iter0.png",
+    "id": 1442,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      5769,
+      5770,
+      5771,
+      5772
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_traffic light_iter0.png",
+    "id": 1443,
+    "count": 5,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      5773,
+      5774,
+      5775,
+      5776,
+      5777
+    ],
+    "caption": "a photo of 5 traffic lights",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_horse_iter0.png",
+    "id": 1444,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      5778,
+      5779,
+      5780,
+      5781
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_horse_iter0.png",
+    "id": 1445,
+    "count": 5,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      5782,
+      5783,
+      5784,
+      5785,
+      5786
+    ],
+    "caption": "a photo of 5 horses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_backpack_iter0.png",
+    "id": 1446,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      5787,
+      5788,
+      5789,
+      5790
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_backpack_iter0.png",
+    "id": 1447,
+    "count": 5,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      5791,
+      5792,
+      5793,
+      5794,
+      5795
+    ],
+    "caption": "a photo of 5 backpacks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bird_iter0.png",
+    "id": 1448,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      5796,
+      5797,
+      5798,
+      5799
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bird_iter0.png",
+    "id": 1449,
+    "count": 5,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      5800,
+      5801,
+      5802,
+      5803,
+      5804
+    ],
+    "caption": "a photo of 5 birds",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_broccoli_iter0.png",
+    "id": 1450,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      5805,
+      5806,
+      5807,
+      5808
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_broccoli_iter0.png",
+    "id": 1451,
+    "count": 5,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      5809,
+      5810,
+      5811,
+      5812,
+      5813
+    ],
+    "caption": "a photo of 5 broccolis",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_kite_iter0.png",
+    "id": 1452,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      5814,
+      5815,
+      5816,
+      5817
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_kite_iter0.png",
+    "id": 1453,
+    "count": 5,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      5818,
+      5819,
+      5820,
+      5821,
+      5822
+    ],
+    "caption": "a photo of 5 kites",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_handbag_iter0.png",
+    "id": 1454,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      5823,
+      5824,
+      5825,
+      5826
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_handbag_iter0.png",
+    "id": 1455,
+    "count": 5,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      5827,
+      5828,
+      5829,
+      5830,
+      5831
+    ],
+    "caption": "a photo of 5 handbags",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_person_iter0.png",
+    "id": 1456,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      5832,
+      5833,
+      5834,
+      5835
+    ],
+    "caption": "a photo of 4 people",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_person_iter0.png",
+    "id": 1457,
+    "count": 5,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      5836,
+      5837,
+      5838,
+      5839,
+      5840
+    ],
+    "caption": "a photo of 5 people",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_zebra_iter0.png",
+    "id": 1458,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      5841,
+      5842,
+      5843,
+      5844
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_zebra_iter0.png",
+    "id": 1459,
+    "count": 5,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      5845,
+      5846,
+      5847,
+      5848,
+      5849
+    ],
+    "caption": "a photo of 5 zebras",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_motorcycle_iter0.png",
+    "id": 1460,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      5850,
+      5851,
+      5852,
+      5853
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_motorcycle_iter0.png",
+    "id": 1461,
+    "count": 5,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      5854,
+      5855,
+      5856,
+      5857,
+      5858
+    ],
+    "caption": "a photo of 5 motorcycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cup_iter0.png",
+    "id": 1462,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      5859,
+      5860,
+      5861,
+      5862
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_cup_iter0.png",
+    "id": 1463,
+    "count": 5,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      5863,
+      5864,
+      5865,
+      5866,
+      5867
+    ],
+    "caption": "a photo of 5 cups",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_knife_iter0.png",
+    "id": 1464,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      5868,
+      5869,
+      5870,
+      5871
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_knife_iter0.png",
+    "id": 1465,
+    "count": 5,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      5872,
+      5873,
+      5874,
+      5875,
+      5876
+    ],
+    "caption": "a photo of 5 knives",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_remote_iter0.png",
+    "id": 1466,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      5877,
+      5878,
+      5879,
+      5880
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_remote_iter0.png",
+    "id": 1467,
+    "count": 5,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      5881,
+      5882,
+      5883,
+      5884,
+      5885
+    ],
+    "caption": "a photo of 5 remotes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_surfboard_iter0.png",
+    "id": 1468,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      5886,
+      5887,
+      5888,
+      5889
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_surfboard_iter0.png",
+    "id": 1469,
+    "count": 5,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      5890,
+      5891,
+      5892,
+      5893,
+      5894
+    ],
+    "caption": "a photo of 5 surfboards",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_boat_iter0.png",
+    "id": 1470,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      5895,
+      5896,
+      5897,
+      5898
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_boat_iter0.png",
+    "id": 1471,
+    "count": 5,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      5899,
+      5900,
+      5901,
+      5902,
+      5903
+    ],
+    "caption": "a photo of 5 boats",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_carrot_iter0.png",
+    "id": 1472,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      5904,
+      5905,
+      5906,
+      5907
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_carrot_iter0.png",
+    "id": 1473,
+    "count": 5,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      5908,
+      5909,
+      5910,
+      5911,
+      5912
+    ],
+    "caption": "a photo of 5 carrots",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_vase_iter0.png",
+    "id": 1474,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      5913,
+      5914,
+      5915,
+      5916
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_vase_iter0.png",
+    "id": 1475,
+    "count": 5,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      5917,
+      5918,
+      5919,
+      5920,
+      5921
+    ],
+    "caption": "a photo of 5 vases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_dining table_iter0.png",
+    "id": 1476,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      5922,
+      5923,
+      5924,
+      5925
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_dining table_iter0.png",
+    "id": 1477,
+    "count": 5,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      5926,
+      5927,
+      5928,
+      5929,
+      5930
+    ],
+    "caption": "a photo of 5 dining tables",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bowl_iter0.png",
+    "id": 1478,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      5931,
+      5932,
+      5933,
+      5934
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bowl_iter0.png",
+    "id": 1479,
+    "count": 5,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      5935,
+      5936,
+      5937,
+      5938,
+      5939
+    ],
+    "caption": "a photo of 5 bowls",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_umbrella_iter0.png",
+    "id": 1480,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      5940,
+      5941,
+      5942,
+      5943
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_umbrella_iter0.png",
+    "id": 1481,
+    "count": 5,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      5944,
+      5945,
+      5946,
+      5947,
+      5948
+    ],
+    "caption": "a photo of 5 umbrellas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_sheep_iter0.png",
+    "id": 1482,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      5949,
+      5950,
+      5951,
+      5952
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_sheep_iter0.png",
+    "id": 1483,
+    "count": 5,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      5953,
+      5954,
+      5955,
+      5956,
+      5957
+    ],
+    "caption": "a photo of 5 sheep",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cow_iter0.png",
+    "id": 1484,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      5958,
+      5959,
+      5960,
+      5961
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_cow_iter0.png",
+    "id": 1485,
+    "count": 5,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      5962,
+      5963,
+      5964,
+      5965,
+      5966
+    ],
+    "caption": "a photo of 5 cows",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bench_iter0.png",
+    "id": 1486,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      5967,
+      5968,
+      5969,
+      5970
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bench_iter0.png",
+    "id": 1487,
+    "count": 5,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      5971,
+      5972,
+      5973,
+      5974,
+      5975
+    ],
+    "caption": "a photo of 5 benches",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_tv_iter0.png",
+    "id": 1488,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      5976,
+      5977,
+      5978,
+      5979
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_tv_iter0.png",
+    "id": 1489,
+    "count": 5,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      5980,
+      5981,
+      5982,
+      5983,
+      5984
+    ],
+    "caption": "a photo of 5 tvs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_car_iter0.png",
+    "id": 1490,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      5985,
+      5986,
+      5987,
+      5988
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_car_iter0.png",
+    "id": 1491,
+    "count": 5,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      5989,
+      5990,
+      5991,
+      5992,
+      5993
+    ],
+    "caption": "a photo of 5 cars",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_suitcase_iter0.png",
+    "id": 1492,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      5994,
+      5995,
+      5996,
+      5997
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_suitcase_iter0.png",
+    "id": 1493,
+    "count": 5,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      5998,
+      5999,
+      6000,
+      6001,
+      6002
+    ],
+    "caption": "a photo of 5 suitcases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_donut_iter0.png",
+    "id": 1494,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6003,
+      6004,
+      6005,
+      6006
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_donut_iter0.png",
+    "id": 1495,
+    "count": 5,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6007,
+      6008,
+      6009,
+      6010,
+      6011
+    ],
+    "caption": "a photo of 5 donuts",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_truck_iter0.png",
+    "id": 1496,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6012,
+      6013,
+      6014,
+      6015
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_truck_iter0.png",
+    "id": 1497,
+    "count": 5,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6016,
+      6017,
+      6018,
+      6019,
+      6020
+    ],
+    "caption": "a photo of 5 trucks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_wine glass_iter0.png",
+    "id": 1498,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6021,
+      6022,
+      6023,
+      6024
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_wine glass_iter0.png",
+    "id": 1499,
+    "count": 5,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6025,
+      6026,
+      6027,
+      6028,
+      6029
+    ],
+    "caption": "a photo of 5 wine glasses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_orange_iter0.png",
+    "id": 1500,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6030,
+      6031,
+      6032,
+      6033
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_orange_iter0.png",
+    "id": 1501,
+    "count": 5,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6034,
+      6035,
+      6036,
+      6037,
+      6038
+    ],
+    "caption": "a photo of 5 oranges",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_chair_iter0.png",
+    "id": 1502,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6039,
+      6040,
+      6041,
+      6042
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_chair_iter0.png",
+    "id": 1503,
+    "count": 5,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6043,
+      6044,
+      6045,
+      6046,
+      6047
+    ],
+    "caption": "a photo of 5 chairs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cake_iter0.png",
+    "id": 1504,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6048,
+      6049,
+      6050,
+      6051
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_cake_iter0.png",
+    "id": 1505,
+    "count": 5,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6052,
+      6053,
+      6054,
+      6055,
+      6056
+    ],
+    "caption": "a photo of 5 cakes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bottle_iter0.png",
+    "id": 1506,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6057,
+      6058,
+      6059,
+      6060
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bottle_iter0.png",
+    "id": 1507,
+    "count": 5,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6061,
+      6062,
+      6063,
+      6064,
+      6065
+    ],
+    "caption": "a photo of 5 bottles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_pizza_iter0.png",
+    "id": 1508,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6066,
+      6067,
+      6068,
+      6069
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_pizza_iter0.png",
+    "id": 1509,
+    "count": 5,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6070,
+      6071,
+      6072,
+      6073,
+      6074
+    ],
+    "caption": "a photo of 5 pizzas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bicycle_iter0.png",
+    "id": 1510,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6075,
+      6076,
+      6077,
+      6078
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bicycle_iter0.png",
+    "id": 1511,
+    "count": 5,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6079,
+      6080,
+      6081,
+      6082,
+      6083
+    ],
+    "caption": "a photo of 5 bicycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_potted plant_iter0.png",
+    "id": 1512,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6084,
+      6085,
+      6086,
+      6087
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_potted plant_iter0.png",
+    "id": 1513,
+    "count": 5,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6088,
+      6089,
+      6090,
+      6091,
+      6092
+    ],
+    "caption": "a photo of 5 potted plants",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_book_iter0.png",
+    "id": 1514,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6093,
+      6094,
+      6095,
+      6096
+    ],
+    "caption": "a photo of 4 books",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_book_iter0.png",
+    "id": 1515,
+    "count": 5,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6097,
+      6098,
+      6099,
+      6100,
+      6101
+    ],
+    "caption": "a photo of 5 books",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bus_iter0.png",
+    "id": 1516,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6102,
+      6103,
+      6104,
+      6105
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_bus_iter0.png",
+    "id": 1517,
+    "count": 5,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6106,
+      6107,
+      6108,
+      6109,
+      6110
+    ],
+    "caption": "a photo of 5 buses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_clock_iter0.png",
+    "id": 1518,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.025390625,
+        0.357421875,
+        0.189453125,
+        0.603515625
+      ],
+      [
+        0.7265625,
+        0.201171875,
+        0.908203125,
+        0.375
+      ],
+      [
+        0.251953125,
+        0.0625,
+        0.49609375,
+        0.248046875
+      ],
+      [
+        0.439453125,
+        0.798828125,
+        0.7890625,
+        0.994140625
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6111,
+      6112,
+      6113,
+      6114
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_5_clock_iter0.png",
+    "id": 1519,
+    "count": 5,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.240234375,
+        0.43359375,
+        0.404296875,
+        0.6796875
+      ],
+      [
+        0.453125,
+        0.291015625,
+        0.697265625,
+        0.4765625
+      ],
+      [
+        0.439453125,
+        0.5078125,
+        0.642578125,
+        0.7265625
+      ],
+      [
+        0.2734375,
+        0.22265625,
+        0.42578125,
+        0.384765625
+      ],
+      [
+        0.666015625,
+        0.47265625,
+        0.83203125,
+        0.720703125
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6115,
+      6116,
+      6117,
+      6118,
+      6119
+    ],
+    "caption": "a photo of 5 clocks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_banana_iter1.png",
+    "id": 1520,
+    "count": 5,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6120,
+      6121,
+      6122,
+      6123,
+      6124
+    ],
+    "caption": "a photo of 5 bananas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_banana_iter1.png",
+    "id": 1521,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6125,
+      6126,
+      6127,
+      6128
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_traffic light_iter1.png",
+    "id": 1522,
+    "count": 5,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6129,
+      6130,
+      6131,
+      6132,
+      6133
+    ],
+    "caption": "a photo of 5 traffic lights",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_traffic light_iter1.png",
+    "id": 1523,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6134,
+      6135,
+      6136,
+      6137
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_horse_iter1.png",
+    "id": 1524,
+    "count": 5,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6138,
+      6139,
+      6140,
+      6141,
+      6142
+    ],
+    "caption": "a photo of 5 horses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_horse_iter1.png",
+    "id": 1525,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6143,
+      6144,
+      6145,
+      6146
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_backpack_iter1.png",
+    "id": 1526,
+    "count": 5,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6147,
+      6148,
+      6149,
+      6150,
+      6151
+    ],
+    "caption": "a photo of 5 backpacks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_backpack_iter1.png",
+    "id": 1527,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6152,
+      6153,
+      6154,
+      6155
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bird_iter1.png",
+    "id": 1528,
+    "count": 5,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6156,
+      6157,
+      6158,
+      6159,
+      6160
+    ],
+    "caption": "a photo of 5 birds",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bird_iter1.png",
+    "id": 1529,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6161,
+      6162,
+      6163,
+      6164
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_broccoli_iter1.png",
+    "id": 1530,
+    "count": 5,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6165,
+      6166,
+      6167,
+      6168,
+      6169
+    ],
+    "caption": "a photo of 5 broccolis",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_broccoli_iter1.png",
+    "id": 1531,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6170,
+      6171,
+      6172,
+      6173
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_kite_iter1.png",
+    "id": 1532,
+    "count": 5,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6174,
+      6175,
+      6176,
+      6177,
+      6178
+    ],
+    "caption": "a photo of 5 kites",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_kite_iter1.png",
+    "id": 1533,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6179,
+      6180,
+      6181,
+      6182
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_handbag_iter1.png",
+    "id": 1534,
+    "count": 5,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6183,
+      6184,
+      6185,
+      6186,
+      6187
+    ],
+    "caption": "a photo of 5 handbags",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_handbag_iter1.png",
+    "id": 1535,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6188,
+      6189,
+      6190,
+      6191
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_person_iter1.png",
+    "id": 1536,
+    "count": 5,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6192,
+      6193,
+      6194,
+      6195,
+      6196
+    ],
+    "caption": "a photo of 5 people",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_person_iter1.png",
+    "id": 1537,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6197,
+      6198,
+      6199,
+      6200
+    ],
+    "caption": "a photo of 4 people",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_zebra_iter1.png",
+    "id": 1538,
+    "count": 5,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6201,
+      6202,
+      6203,
+      6204,
+      6205
+    ],
+    "caption": "a photo of 5 zebras",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_zebra_iter1.png",
+    "id": 1539,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6206,
+      6207,
+      6208,
+      6209
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_motorcycle_iter1.png",
+    "id": 1540,
+    "count": 5,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6210,
+      6211,
+      6212,
+      6213,
+      6214
+    ],
+    "caption": "a photo of 5 motorcycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_motorcycle_iter1.png",
+    "id": 1541,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6215,
+      6216,
+      6217,
+      6218
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_cup_iter1.png",
+    "id": 1542,
+    "count": 5,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6219,
+      6220,
+      6221,
+      6222,
+      6223
+    ],
+    "caption": "a photo of 5 cups",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cup_iter1.png",
+    "id": 1543,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6224,
+      6225,
+      6226,
+      6227
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_knife_iter1.png",
+    "id": 1544,
+    "count": 5,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6228,
+      6229,
+      6230,
+      6231,
+      6232
+    ],
+    "caption": "a photo of 5 knives",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_knife_iter1.png",
+    "id": 1545,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6233,
+      6234,
+      6235,
+      6236
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_remote_iter1.png",
+    "id": 1546,
+    "count": 5,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6237,
+      6238,
+      6239,
+      6240,
+      6241
+    ],
+    "caption": "a photo of 5 remotes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_remote_iter1.png",
+    "id": 1547,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6242,
+      6243,
+      6244,
+      6245
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_surfboard_iter1.png",
+    "id": 1548,
+    "count": 5,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6246,
+      6247,
+      6248,
+      6249,
+      6250
+    ],
+    "caption": "a photo of 5 surfboards",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_surfboard_iter1.png",
+    "id": 1549,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6251,
+      6252,
+      6253,
+      6254
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_boat_iter1.png",
+    "id": 1550,
+    "count": 5,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6255,
+      6256,
+      6257,
+      6258,
+      6259
+    ],
+    "caption": "a photo of 5 boats",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_boat_iter1.png",
+    "id": 1551,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6260,
+      6261,
+      6262,
+      6263
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_carrot_iter1.png",
+    "id": 1552,
+    "count": 5,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6264,
+      6265,
+      6266,
+      6267,
+      6268
+    ],
+    "caption": "a photo of 5 carrots",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_carrot_iter1.png",
+    "id": 1553,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6269,
+      6270,
+      6271,
+      6272
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_vase_iter1.png",
+    "id": 1554,
+    "count": 5,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6273,
+      6274,
+      6275,
+      6276,
+      6277
+    ],
+    "caption": "a photo of 5 vases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_vase_iter1.png",
+    "id": 1555,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6278,
+      6279,
+      6280,
+      6281
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_dining table_iter1.png",
+    "id": 1556,
+    "count": 5,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6282,
+      6283,
+      6284,
+      6285,
+      6286
+    ],
+    "caption": "a photo of 5 dining tables",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_dining table_iter1.png",
+    "id": 1557,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6287,
+      6288,
+      6289,
+      6290
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bowl_iter1.png",
+    "id": 1558,
+    "count": 5,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6291,
+      6292,
+      6293,
+      6294,
+      6295
+    ],
+    "caption": "a photo of 5 bowls",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bowl_iter1.png",
+    "id": 1559,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6296,
+      6297,
+      6298,
+      6299
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_umbrella_iter1.png",
+    "id": 1560,
+    "count": 5,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6300,
+      6301,
+      6302,
+      6303,
+      6304
+    ],
+    "caption": "a photo of 5 umbrellas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_umbrella_iter1.png",
+    "id": 1561,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6305,
+      6306,
+      6307,
+      6308
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_sheep_iter1.png",
+    "id": 1562,
+    "count": 5,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6309,
+      6310,
+      6311,
+      6312,
+      6313
+    ],
+    "caption": "a photo of 5 sheep",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_sheep_iter1.png",
+    "id": 1563,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6314,
+      6315,
+      6316,
+      6317
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_cow_iter1.png",
+    "id": 1564,
+    "count": 5,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6318,
+      6319,
+      6320,
+      6321,
+      6322
+    ],
+    "caption": "a photo of 5 cows",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cow_iter1.png",
+    "id": 1565,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6323,
+      6324,
+      6325,
+      6326
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bench_iter1.png",
+    "id": 1566,
+    "count": 5,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6327,
+      6328,
+      6329,
+      6330,
+      6331
+    ],
+    "caption": "a photo of 5 benches",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bench_iter1.png",
+    "id": 1567,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6332,
+      6333,
+      6334,
+      6335
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_tv_iter1.png",
+    "id": 1568,
+    "count": 5,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6336,
+      6337,
+      6338,
+      6339,
+      6340
+    ],
+    "caption": "a photo of 5 tvs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_tv_iter1.png",
+    "id": 1569,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6341,
+      6342,
+      6343,
+      6344
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_car_iter1.png",
+    "id": 1570,
+    "count": 5,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      6345,
+      6346,
+      6347,
+      6348,
+      6349
+    ],
+    "caption": "a photo of 5 cars",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_car_iter1.png",
+    "id": 1571,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      6350,
+      6351,
+      6352,
+      6353
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_suitcase_iter1.png",
+    "id": 1572,
+    "count": 5,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      6354,
+      6355,
+      6356,
+      6357,
+      6358
+    ],
+    "caption": "a photo of 5 suitcases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_suitcase_iter1.png",
+    "id": 1573,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      6359,
+      6360,
+      6361,
+      6362
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_donut_iter1.png",
+    "id": 1574,
+    "count": 5,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6363,
+      6364,
+      6365,
+      6366,
+      6367
+    ],
+    "caption": "a photo of 5 donuts",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_donut_iter1.png",
+    "id": 1575,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6368,
+      6369,
+      6370,
+      6371
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_truck_iter1.png",
+    "id": 1576,
+    "count": 5,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6372,
+      6373,
+      6374,
+      6375,
+      6376
+    ],
+    "caption": "a photo of 5 trucks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_truck_iter1.png",
+    "id": 1577,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6377,
+      6378,
+      6379,
+      6380
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_wine glass_iter1.png",
+    "id": 1578,
+    "count": 5,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6381,
+      6382,
+      6383,
+      6384,
+      6385
+    ],
+    "caption": "a photo of 5 wine glasses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_wine glass_iter1.png",
+    "id": 1579,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6386,
+      6387,
+      6388,
+      6389
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_orange_iter1.png",
+    "id": 1580,
+    "count": 5,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6390,
+      6391,
+      6392,
+      6393,
+      6394
+    ],
+    "caption": "a photo of 5 oranges",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_orange_iter1.png",
+    "id": 1581,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6395,
+      6396,
+      6397,
+      6398
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_chair_iter1.png",
+    "id": 1582,
+    "count": 5,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6399,
+      6400,
+      6401,
+      6402,
+      6403
+    ],
+    "caption": "a photo of 5 chairs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_chair_iter1.png",
+    "id": 1583,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6404,
+      6405,
+      6406,
+      6407
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_cake_iter1.png",
+    "id": 1584,
+    "count": 5,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6408,
+      6409,
+      6410,
+      6411,
+      6412
+    ],
+    "caption": "a photo of 5 cakes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cake_iter1.png",
+    "id": 1585,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6413,
+      6414,
+      6415,
+      6416
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bottle_iter1.png",
+    "id": 1586,
+    "count": 5,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6417,
+      6418,
+      6419,
+      6420,
+      6421
+    ],
+    "caption": "a photo of 5 bottles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bottle_iter1.png",
+    "id": 1587,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6422,
+      6423,
+      6424,
+      6425
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_pizza_iter1.png",
+    "id": 1588,
+    "count": 5,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6426,
+      6427,
+      6428,
+      6429,
+      6430
+    ],
+    "caption": "a photo of 5 pizzas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_pizza_iter1.png",
+    "id": 1589,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6431,
+      6432,
+      6433,
+      6434
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bicycle_iter1.png",
+    "id": 1590,
+    "count": 5,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6435,
+      6436,
+      6437,
+      6438,
+      6439
+    ],
+    "caption": "a photo of 5 bicycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bicycle_iter1.png",
+    "id": 1591,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6440,
+      6441,
+      6442,
+      6443
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_potted plant_iter1.png",
+    "id": 1592,
+    "count": 5,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6444,
+      6445,
+      6446,
+      6447,
+      6448
+    ],
+    "caption": "a photo of 5 potted plants",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_potted plant_iter1.png",
+    "id": 1593,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6449,
+      6450,
+      6451,
+      6452
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_book_iter1.png",
+    "id": 1594,
+    "count": 5,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6453,
+      6454,
+      6455,
+      6456,
+      6457
+    ],
+    "caption": "a photo of 5 books",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_book_iter1.png",
+    "id": 1595,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6458,
+      6459,
+      6460,
+      6461
+    ],
+    "caption": "a photo of 4 books",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_bus_iter1.png",
+    "id": 1596,
+    "count": 5,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6462,
+      6463,
+      6464,
+      6465,
+      6466
+    ],
+    "caption": "a photo of 5 buses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bus_iter1.png",
+    "id": 1597,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6467,
+      6468,
+      6469,
+      6470
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_5_clock_iter1.png",
+    "id": 1598,
+    "count": 5,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.80078125,
+        0.306640625,
+        0.982421875,
+        0.48046875
+      ],
+      [
+        0.734375,
+        0.02734375,
+        0.978515625,
+        0.212890625
+      ],
+      [
+        0.63671875,
+        0.802734375,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.255859375,
+        0.37109375
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6471,
+      6472,
+      6473,
+      6474,
+      6475
+    ],
+    "caption": "a photo of 5 clocks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_clock_iter1.png",
+    "id": 1599,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.3046875,
+        0.49609375,
+        0.46875,
+        0.7421875
+      ],
+      [
+        0.509765625,
+        0.32421875,
+        0.75390625,
+        0.509765625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.630859375,
+        0.673828125
+      ],
+      [
+        0.291015625,
+        0.3125,
+        0.443359375,
+        0.474609375
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6476,
+      6477,
+      6478,
+      6479
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_banana_iter2.png",
+    "id": 1600,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6480,
+      6481,
+      6482,
+      6483
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_banana_iter2.png",
+    "id": 1601,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6484,
+      6485,
+      6486,
+      6487
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_traffic light_iter2.png",
+    "id": 1602,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6488,
+      6489,
+      6490,
+      6491
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_traffic light_iter2.png",
+    "id": 1603,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6492,
+      6493,
+      6494,
+      6495
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_horse_iter2.png",
+    "id": 1604,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6496,
+      6497,
+      6498,
+      6499
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_horse_iter2.png",
+    "id": 1605,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6500,
+      6501,
+      6502,
+      6503
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_backpack_iter2.png",
+    "id": 1606,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6504,
+      6505,
+      6506,
+      6507
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_backpack_iter2.png",
+    "id": 1607,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6508,
+      6509,
+      6510,
+      6511
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bird_iter2.png",
+    "id": 1608,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6512,
+      6513,
+      6514,
+      6515
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bird_iter2.png",
+    "id": 1609,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6516,
+      6517,
+      6518,
+      6519
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_broccoli_iter2.png",
+    "id": 1610,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6520,
+      6521,
+      6522,
+      6523
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_broccoli_iter2.png",
+    "id": 1611,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6524,
+      6525,
+      6526,
+      6527
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_kite_iter2.png",
+    "id": 1612,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6528,
+      6529,
+      6530,
+      6531
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_kite_iter2.png",
+    "id": 1613,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6532,
+      6533,
+      6534,
+      6535
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_handbag_iter2.png",
+    "id": 1614,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6536,
+      6537,
+      6538,
+      6539
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_handbag_iter2.png",
+    "id": 1615,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6540,
+      6541,
+      6542,
+      6543
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_person_iter2.png",
+    "id": 1616,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6544,
+      6545,
+      6546,
+      6547
+    ],
+    "caption": "a photo of 4 people",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_person_iter2.png",
+    "id": 1617,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6548,
+      6549,
+      6550,
+      6551
+    ],
+    "caption": "a photo of 4 people",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_zebra_iter2.png",
+    "id": 1618,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6552,
+      6553,
+      6554,
+      6555
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_zebra_iter2.png",
+    "id": 1619,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6556,
+      6557,
+      6558,
+      6559
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_motorcycle_iter2.png",
+    "id": 1620,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6560,
+      6561,
+      6562,
+      6563
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_motorcycle_iter2.png",
+    "id": 1621,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6564,
+      6565,
+      6566,
+      6567
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cup_iter2.png",
+    "id": 1622,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6568,
+      6569,
+      6570,
+      6571
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cup_iter2.png",
+    "id": 1623,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6572,
+      6573,
+      6574,
+      6575
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_knife_iter2.png",
+    "id": 1624,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6576,
+      6577,
+      6578,
+      6579
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_knife_iter2.png",
+    "id": 1625,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6580,
+      6581,
+      6582,
+      6583
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_remote_iter2.png",
+    "id": 1626,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6584,
+      6585,
+      6586,
+      6587
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_remote_iter2.png",
+    "id": 1627,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6588,
+      6589,
+      6590,
+      6591
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_surfboard_iter2.png",
+    "id": 1628,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6592,
+      6593,
+      6594,
+      6595
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_surfboard_iter2.png",
+    "id": 1629,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6596,
+      6597,
+      6598,
+      6599
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_boat_iter2.png",
+    "id": 1630,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6600,
+      6601,
+      6602,
+      6603
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_boat_iter2.png",
+    "id": 1631,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6604,
+      6605,
+      6606,
+      6607
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_carrot_iter2.png",
+    "id": 1632,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6608,
+      6609,
+      6610,
+      6611
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_carrot_iter2.png",
+    "id": 1633,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6612,
+      6613,
+      6614,
+      6615
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_vase_iter2.png",
+    "id": 1634,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6616,
+      6617,
+      6618,
+      6619
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_vase_iter2.png",
+    "id": 1635,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6620,
+      6621,
+      6622,
+      6623
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_dining table_iter2.png",
+    "id": 1636,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6624,
+      6625,
+      6626,
+      6627
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_dining table_iter2.png",
+    "id": 1637,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6628,
+      6629,
+      6630,
+      6631
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bowl_iter2.png",
+    "id": 1638,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6632,
+      6633,
+      6634,
+      6635
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bowl_iter2.png",
+    "id": 1639,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6636,
+      6637,
+      6638,
+      6639
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_umbrella_iter2.png",
+    "id": 1640,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6640,
+      6641,
+      6642,
+      6643
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_umbrella_iter2.png",
+    "id": 1641,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6644,
+      6645,
+      6646,
+      6647
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_sheep_iter2.png",
+    "id": 1642,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6648,
+      6649,
+      6650,
+      6651
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_sheep_iter2.png",
+    "id": 1643,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6652,
+      6653,
+      6654,
+      6655
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cow_iter2.png",
+    "id": 1644,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6656,
+      6657,
+      6658,
+      6659
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cow_iter2.png",
+    "id": 1645,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6660,
+      6661,
+      6662,
+      6663
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bench_iter2.png",
+    "id": 1646,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6664,
+      6665,
+      6666,
+      6667
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bench_iter2.png",
+    "id": 1647,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6668,
+      6669,
+      6670,
+      6671
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_tv_iter2.png",
+    "id": 1648,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6672,
+      6673,
+      6674,
+      6675
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_tv_iter2.png",
+    "id": 1649,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6676,
+      6677,
+      6678,
+      6679
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_car_iter2.png",
+    "id": 1650,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      6680,
+      6681,
+      6682,
+      6683
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_car_iter2.png",
+    "id": 1651,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      6684,
+      6685,
+      6686,
+      6687
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_suitcase_iter2.png",
+    "id": 1652,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      6688,
+      6689,
+      6690,
+      6691
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_suitcase_iter2.png",
+    "id": 1653,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      6692,
+      6693,
+      6694,
+      6695
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_donut_iter2.png",
+    "id": 1654,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6696,
+      6697,
+      6698,
+      6699
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_donut_iter2.png",
+    "id": 1655,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      6700,
+      6701,
+      6702,
+      6703
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_truck_iter2.png",
+    "id": 1656,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6704,
+      6705,
+      6706,
+      6707
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_truck_iter2.png",
+    "id": 1657,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      6708,
+      6709,
+      6710,
+      6711
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_wine glass_iter2.png",
+    "id": 1658,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6712,
+      6713,
+      6714,
+      6715
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_wine glass_iter2.png",
+    "id": 1659,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      6716,
+      6717,
+      6718,
+      6719
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_orange_iter2.png",
+    "id": 1660,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6720,
+      6721,
+      6722,
+      6723
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_orange_iter2.png",
+    "id": 1661,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      6724,
+      6725,
+      6726,
+      6727
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_chair_iter2.png",
+    "id": 1662,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6728,
+      6729,
+      6730,
+      6731
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_chair_iter2.png",
+    "id": 1663,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      6732,
+      6733,
+      6734,
+      6735
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cake_iter2.png",
+    "id": 1664,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6736,
+      6737,
+      6738,
+      6739
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cake_iter2.png",
+    "id": 1665,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      6740,
+      6741,
+      6742,
+      6743
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bottle_iter2.png",
+    "id": 1666,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6744,
+      6745,
+      6746,
+      6747
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bottle_iter2.png",
+    "id": 1667,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      6748,
+      6749,
+      6750,
+      6751
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_pizza_iter2.png",
+    "id": 1668,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6752,
+      6753,
+      6754,
+      6755
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_pizza_iter2.png",
+    "id": 1669,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      6756,
+      6757,
+      6758,
+      6759
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bicycle_iter2.png",
+    "id": 1670,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6760,
+      6761,
+      6762,
+      6763
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bicycle_iter2.png",
+    "id": 1671,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      6764,
+      6765,
+      6766,
+      6767
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_potted plant_iter2.png",
+    "id": 1672,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6768,
+      6769,
+      6770,
+      6771
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_potted plant_iter2.png",
+    "id": 1673,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      6772,
+      6773,
+      6774,
+      6775
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_book_iter2.png",
+    "id": 1674,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6776,
+      6777,
+      6778,
+      6779
+    ],
+    "caption": "a photo of 4 books",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_book_iter2.png",
+    "id": 1675,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      6780,
+      6781,
+      6782,
+      6783
+    ],
+    "caption": "a photo of 4 books",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bus_iter2.png",
+    "id": 1676,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6784,
+      6785,
+      6786,
+      6787
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bus_iter2.png",
+    "id": 1677,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      6788,
+      6789,
+      6790,
+      6791
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_clock_iter2.png",
+    "id": 1678,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.02734375,
+        0.728515625,
+        0.19140625,
+        0.974609375
+      ],
+      [
+        0.734375,
+        0.0703125,
+        0.978515625,
+        0.255859375
+      ],
+      [
+        0.779296875,
+        0.7265625,
+        0.986328125,
+        0.998046875
+      ],
+      [
+        0.021484375,
+        0.0390625,
+        0.173828125,
+        0.201171875
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6792,
+      6793,
+      6794,
+      6795
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_clock_iter2.png",
+    "id": 1679,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.1875,
+        0.380859375,
+        0.447265625,
+        0.73046875
+      ],
+      [
+        0.505859375,
+        0.255859375,
+        0.68359375,
+        0.44140625
+      ],
+      [
+        0.427734375,
+        0.455078125,
+        0.70703125,
+        0.666015625
+      ],
+      [
+        0.29296875,
+        0.140625,
+        0.49609375,
+        0.404296875
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      6796,
+      6797,
+      6798,
+      6799
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_banana_iter3.png",
+    "id": 1680,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6800,
+      6801,
+      6802,
+      6803
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_banana_iter3.png",
+    "id": 1681,
+    "count": 4,
+    "class": "banana",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "banana",
+      "banana",
+      "banana",
+      "banana"
+    ],
+    "box_ids": [
+      6804,
+      6805,
+      6806,
+      6807
+    ],
+    "caption": "a photo of 4 bananas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_traffic light_iter3.png",
+    "id": 1682,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6808,
+      6809,
+      6810,
+      6811
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_traffic light_iter3.png",
+    "id": 1683,
+    "count": 4,
+    "class": "traffic light",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "traffic light",
+      "traffic light",
+      "traffic light",
+      "traffic light"
+    ],
+    "box_ids": [
+      6812,
+      6813,
+      6814,
+      6815
+    ],
+    "caption": "a photo of 4 traffic lights",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_horse_iter3.png",
+    "id": 1684,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6816,
+      6817,
+      6818,
+      6819
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_horse_iter3.png",
+    "id": 1685,
+    "count": 4,
+    "class": "horse",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "horse",
+      "horse",
+      "horse",
+      "horse"
+    ],
+    "box_ids": [
+      6820,
+      6821,
+      6822,
+      6823
+    ],
+    "caption": "a photo of 4 horses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_backpack_iter3.png",
+    "id": 1686,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6824,
+      6825,
+      6826,
+      6827
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_backpack_iter3.png",
+    "id": 1687,
+    "count": 4,
+    "class": "backpack",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "backpack",
+      "backpack",
+      "backpack",
+      "backpack"
+    ],
+    "box_ids": [
+      6828,
+      6829,
+      6830,
+      6831
+    ],
+    "caption": "a photo of 4 backpacks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bird_iter3.png",
+    "id": 1688,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6832,
+      6833,
+      6834,
+      6835
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bird_iter3.png",
+    "id": 1689,
+    "count": 4,
+    "class": "bird",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bird",
+      "bird",
+      "bird",
+      "bird"
+    ],
+    "box_ids": [
+      6836,
+      6837,
+      6838,
+      6839
+    ],
+    "caption": "a photo of 4 birds",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_broccoli_iter3.png",
+    "id": 1690,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6840,
+      6841,
+      6842,
+      6843
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_broccoli_iter3.png",
+    "id": 1691,
+    "count": 4,
+    "class": "broccoli",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "broccoli",
+      "broccoli",
+      "broccoli",
+      "broccoli"
+    ],
+    "box_ids": [
+      6844,
+      6845,
+      6846,
+      6847
+    ],
+    "caption": "a photo of 4 broccolis",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_kite_iter3.png",
+    "id": 1692,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6848,
+      6849,
+      6850,
+      6851
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_kite_iter3.png",
+    "id": 1693,
+    "count": 4,
+    "class": "kite",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "kite",
+      "kite",
+      "kite",
+      "kite"
+    ],
+    "box_ids": [
+      6852,
+      6853,
+      6854,
+      6855
+    ],
+    "caption": "a photo of 4 kites",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_handbag_iter3.png",
+    "id": 1694,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6856,
+      6857,
+      6858,
+      6859
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_handbag_iter3.png",
+    "id": 1695,
+    "count": 4,
+    "class": "handbag",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "handbag",
+      "handbag",
+      "handbag",
+      "handbag"
+    ],
+    "box_ids": [
+      6860,
+      6861,
+      6862,
+      6863
+    ],
+    "caption": "a photo of 4 handbags",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_person_iter3.png",
+    "id": 1696,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6864,
+      6865,
+      6866,
+      6867
+    ],
+    "caption": "a photo of 4 people",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_person_iter3.png",
+    "id": 1697,
+    "count": 4,
+    "class": "person",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "person",
+      "person",
+      "person",
+      "person"
+    ],
+    "box_ids": [
+      6868,
+      6869,
+      6870,
+      6871
+    ],
+    "caption": "a photo of 4 people",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_zebra_iter3.png",
+    "id": 1698,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6872,
+      6873,
+      6874,
+      6875
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_zebra_iter3.png",
+    "id": 1699,
+    "count": 4,
+    "class": "zebra",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "zebra",
+      "zebra",
+      "zebra",
+      "zebra"
+    ],
+    "box_ids": [
+      6876,
+      6877,
+      6878,
+      6879
+    ],
+    "caption": "a photo of 4 zebras",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_motorcycle_iter3.png",
+    "id": 1700,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6880,
+      6881,
+      6882,
+      6883
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_motorcycle_iter3.png",
+    "id": 1701,
+    "count": 4,
+    "class": "motorcycle",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "motorcycle",
+      "motorcycle",
+      "motorcycle",
+      "motorcycle"
+    ],
+    "box_ids": [
+      6884,
+      6885,
+      6886,
+      6887
+    ],
+    "caption": "a photo of 4 motorcycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cup_iter3.png",
+    "id": 1702,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6888,
+      6889,
+      6890,
+      6891
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cup_iter3.png",
+    "id": 1703,
+    "count": 4,
+    "class": "cup",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "cup",
+      "cup",
+      "cup",
+      "cup"
+    ],
+    "box_ids": [
+      6892,
+      6893,
+      6894,
+      6895
+    ],
+    "caption": "a photo of 4 cups",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_knife_iter3.png",
+    "id": 1704,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6896,
+      6897,
+      6898,
+      6899
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_knife_iter3.png",
+    "id": 1705,
+    "count": 4,
+    "class": "knife",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "knife",
+      "knife",
+      "knife",
+      "knife"
+    ],
+    "box_ids": [
+      6900,
+      6901,
+      6902,
+      6903
+    ],
+    "caption": "a photo of 4 knives",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_remote_iter3.png",
+    "id": 1706,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6904,
+      6905,
+      6906,
+      6907
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_remote_iter3.png",
+    "id": 1707,
+    "count": 4,
+    "class": "remote",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "remote",
+      "remote",
+      "remote",
+      "remote"
+    ],
+    "box_ids": [
+      6908,
+      6909,
+      6910,
+      6911
+    ],
+    "caption": "a photo of 4 remotes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_surfboard_iter3.png",
+    "id": 1708,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6912,
+      6913,
+      6914,
+      6915
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_surfboard_iter3.png",
+    "id": 1709,
+    "count": 4,
+    "class": "surfboard",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "surfboard",
+      "surfboard",
+      "surfboard",
+      "surfboard"
+    ],
+    "box_ids": [
+      6916,
+      6917,
+      6918,
+      6919
+    ],
+    "caption": "a photo of 4 surfboards",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_boat_iter3.png",
+    "id": 1710,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6920,
+      6921,
+      6922,
+      6923
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_boat_iter3.png",
+    "id": 1711,
+    "count": 4,
+    "class": "boat",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "boat",
+      "boat",
+      "boat",
+      "boat"
+    ],
+    "box_ids": [
+      6924,
+      6925,
+      6926,
+      6927
+    ],
+    "caption": "a photo of 4 boats",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_carrot_iter3.png",
+    "id": 1712,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6928,
+      6929,
+      6930,
+      6931
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_carrot_iter3.png",
+    "id": 1713,
+    "count": 4,
+    "class": "carrot",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "carrot",
+      "carrot",
+      "carrot",
+      "carrot"
+    ],
+    "box_ids": [
+      6932,
+      6933,
+      6934,
+      6935
+    ],
+    "caption": "a photo of 4 carrots",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_vase_iter3.png",
+    "id": 1714,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6936,
+      6937,
+      6938,
+      6939
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_vase_iter3.png",
+    "id": 1715,
+    "count": 4,
+    "class": "vase",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "vase",
+      "vase",
+      "vase",
+      "vase"
+    ],
+    "box_ids": [
+      6940,
+      6941,
+      6942,
+      6943
+    ],
+    "caption": "a photo of 4 vases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_dining table_iter3.png",
+    "id": 1716,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6944,
+      6945,
+      6946,
+      6947
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_dining table_iter3.png",
+    "id": 1717,
+    "count": 4,
+    "class": "dining table",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "dining table",
+      "dining table",
+      "dining table",
+      "dining table"
+    ],
+    "box_ids": [
+      6948,
+      6949,
+      6950,
+      6951
+    ],
+    "caption": "a photo of 4 dining tables",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bowl_iter3.png",
+    "id": 1718,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6952,
+      6953,
+      6954,
+      6955
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bowl_iter3.png",
+    "id": 1719,
+    "count": 4,
+    "class": "bowl",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bowl",
+      "bowl",
+      "bowl",
+      "bowl"
+    ],
+    "box_ids": [
+      6956,
+      6957,
+      6958,
+      6959
+    ],
+    "caption": "a photo of 4 bowls",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_umbrella_iter3.png",
+    "id": 1720,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6960,
+      6961,
+      6962,
+      6963
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_umbrella_iter3.png",
+    "id": 1721,
+    "count": 4,
+    "class": "umbrella",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "umbrella",
+      "umbrella",
+      "umbrella",
+      "umbrella"
+    ],
+    "box_ids": [
+      6964,
+      6965,
+      6966,
+      6967
+    ],
+    "caption": "a photo of 4 umbrellas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_sheep_iter3.png",
+    "id": 1722,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6968,
+      6969,
+      6970,
+      6971
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_sheep_iter3.png",
+    "id": 1723,
+    "count": 4,
+    "class": "sheep",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "sheep",
+      "sheep",
+      "sheep",
+      "sheep"
+    ],
+    "box_ids": [
+      6972,
+      6973,
+      6974,
+      6975
+    ],
+    "caption": "a photo of 4 sheep",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cow_iter3.png",
+    "id": 1724,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6976,
+      6977,
+      6978,
+      6979
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cow_iter3.png",
+    "id": 1725,
+    "count": 4,
+    "class": "cow",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "cow",
+      "cow",
+      "cow",
+      "cow"
+    ],
+    "box_ids": [
+      6980,
+      6981,
+      6982,
+      6983
+    ],
+    "caption": "a photo of 4 cows",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bench_iter3.png",
+    "id": 1726,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6984,
+      6985,
+      6986,
+      6987
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bench_iter3.png",
+    "id": 1727,
+    "count": 4,
+    "class": "bench",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bench",
+      "bench",
+      "bench",
+      "bench"
+    ],
+    "box_ids": [
+      6988,
+      6989,
+      6990,
+      6991
+    ],
+    "caption": "a photo of 4 benches",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_tv_iter3.png",
+    "id": 1728,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6992,
+      6993,
+      6994,
+      6995
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_tv_iter3.png",
+    "id": 1729,
+    "count": 4,
+    "class": "tv",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "tv",
+      "tv",
+      "tv",
+      "tv"
+    ],
+    "box_ids": [
+      6996,
+      6997,
+      6998,
+      6999
+    ],
+    "caption": "a photo of 4 tvs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_car_iter3.png",
+    "id": 1730,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      7000,
+      7001,
+      7002,
+      7003
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_car_iter3.png",
+    "id": 1731,
+    "count": 4,
+    "class": "car",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "car",
+      "car",
+      "car",
+      "car"
+    ],
+    "box_ids": [
+      7004,
+      7005,
+      7006,
+      7007
+    ],
+    "caption": "a photo of 4 cars",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_suitcase_iter3.png",
+    "id": 1732,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      7008,
+      7009,
+      7010,
+      7011
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_suitcase_iter3.png",
+    "id": 1733,
+    "count": 4,
+    "class": "suitcase",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "suitcase",
+      "suitcase",
+      "suitcase",
+      "suitcase"
+    ],
+    "box_ids": [
+      7012,
+      7013,
+      7014,
+      7015
+    ],
+    "caption": "a photo of 4 suitcases",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_donut_iter3.png",
+    "id": 1734,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      7016,
+      7017,
+      7018,
+      7019
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_donut_iter3.png",
+    "id": 1735,
+    "count": 4,
+    "class": "donut",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "donut",
+      "donut",
+      "donut",
+      "donut"
+    ],
+    "box_ids": [
+      7020,
+      7021,
+      7022,
+      7023
+    ],
+    "caption": "a photo of 4 donuts",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_truck_iter3.png",
+    "id": 1736,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      7024,
+      7025,
+      7026,
+      7027
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_truck_iter3.png",
+    "id": 1737,
+    "count": 4,
+    "class": "truck",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "truck",
+      "truck",
+      "truck",
+      "truck"
+    ],
+    "box_ids": [
+      7028,
+      7029,
+      7030,
+      7031
+    ],
+    "caption": "a photo of 4 trucks",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_wine glass_iter3.png",
+    "id": 1738,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      7032,
+      7033,
+      7034,
+      7035
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_wine glass_iter3.png",
+    "id": 1739,
+    "count": 4,
+    "class": "wine glass",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "wine glass",
+      "wine glass",
+      "wine glass",
+      "wine glass"
+    ],
+    "box_ids": [
+      7036,
+      7037,
+      7038,
+      7039
+    ],
+    "caption": "a photo of 4 wine glasses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_orange_iter3.png",
+    "id": 1740,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      7040,
+      7041,
+      7042,
+      7043
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_orange_iter3.png",
+    "id": 1741,
+    "count": 4,
+    "class": "orange",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "orange",
+      "orange",
+      "orange",
+      "orange"
+    ],
+    "box_ids": [
+      7044,
+      7045,
+      7046,
+      7047
+    ],
+    "caption": "a photo of 4 oranges",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_chair_iter3.png",
+    "id": 1742,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      7048,
+      7049,
+      7050,
+      7051
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_chair_iter3.png",
+    "id": 1743,
+    "count": 4,
+    "class": "chair",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "chair",
+      "chair",
+      "chair",
+      "chair"
+    ],
+    "box_ids": [
+      7052,
+      7053,
+      7054,
+      7055
+    ],
+    "caption": "a photo of 4 chairs",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_cake_iter3.png",
+    "id": 1744,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      7056,
+      7057,
+      7058,
+      7059
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_cake_iter3.png",
+    "id": 1745,
+    "count": 4,
+    "class": "cake",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "cake",
+      "cake",
+      "cake",
+      "cake"
+    ],
+    "box_ids": [
+      7060,
+      7061,
+      7062,
+      7063
+    ],
+    "caption": "a photo of 4 cakes",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bottle_iter3.png",
+    "id": 1746,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      7064,
+      7065,
+      7066,
+      7067
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bottle_iter3.png",
+    "id": 1747,
+    "count": 4,
+    "class": "bottle",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bottle",
+      "bottle",
+      "bottle",
+      "bottle"
+    ],
+    "box_ids": [
+      7068,
+      7069,
+      7070,
+      7071
+    ],
+    "caption": "a photo of 4 bottles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_pizza_iter3.png",
+    "id": 1748,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      7072,
+      7073,
+      7074,
+      7075
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_pizza_iter3.png",
+    "id": 1749,
+    "count": 4,
+    "class": "pizza",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "pizza",
+      "pizza",
+      "pizza",
+      "pizza"
+    ],
+    "box_ids": [
+      7076,
+      7077,
+      7078,
+      7079
+    ],
+    "caption": "a photo of 4 pizzas",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bicycle_iter3.png",
+    "id": 1750,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      7080,
+      7081,
+      7082,
+      7083
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bicycle_iter3.png",
+    "id": 1751,
+    "count": 4,
+    "class": "bicycle",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bicycle",
+      "bicycle",
+      "bicycle",
+      "bicycle"
+    ],
+    "box_ids": [
+      7084,
+      7085,
+      7086,
+      7087
+    ],
+    "caption": "a photo of 4 bicycles",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_potted plant_iter3.png",
+    "id": 1752,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      7088,
+      7089,
+      7090,
+      7091
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_potted plant_iter3.png",
+    "id": 1753,
+    "count": 4,
+    "class": "potted plant",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "potted plant",
+      "potted plant",
+      "potted plant",
+      "potted plant"
+    ],
+    "box_ids": [
+      7092,
+      7093,
+      7094,
+      7095
+    ],
+    "caption": "a photo of 4 potted plants",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_book_iter3.png",
+    "id": 1754,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      7096,
+      7097,
+      7098,
+      7099
+    ],
+    "caption": "a photo of 4 books",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_book_iter3.png",
+    "id": 1755,
+    "count": 4,
+    "class": "book",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "book",
+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      7100,
+      7101,
+      7102,
+      7103
+    ],
+    "caption": "a photo of 4 books",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_bus_iter3.png",
+    "id": 1756,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      7104,
+      7105,
+      7106,
+      7107
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_bus_iter3.png",
+    "id": 1757,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "bus",
+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      7108,
+      7109,
+      7110,
+      7111
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_boundary_4_clock_iter3.png",
+    "id": 1758,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.4453125,
+        0.859375,
+        0.6484375,
+        0.994140625
+      ],
+      [
+        0.36328125,
+        0.03515625,
+        0.541015625,
+        0.220703125
+      ],
+      [
+        0.720703125,
+        0.35546875,
+        1.0,
+        0.56640625
+      ],
+      [
+        0.033203125,
+        0.37890625,
+        0.236328125,
+        0.642578125
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      7112,
+      7113,
+      7114,
+      7115
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "boundary"
+  },
+  {
+    "file_name": "position_center_4_clock_iter3.png",
+    "id": 1759,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
+        0.318359375,
+        0.6015625,
+        0.49609375,
+        0.787109375
+      ],
+      [
+        0.30859375,
+        0.466796875,
+        0.587890625,
+        0.677734375
+      ],
+      [
+        0.173828125,
+        0.56640625,
+        0.345703125,
+        0.73828125
+      ]
+    ],
+    "box_captions": [
+      "clock",
+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      7116,
+      7117,
+      7118,
+      7119
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "center"
+  }
+]
\ No newline at end of file