fix:structure

README.md

@@ -39,16 +39,16 @@ Quoting the [dataset's github](https://github.com/aisegmentcn/matting_human_data
 
 ## Dataset Structure
 
-```
+```text
 └── data/
-├── clip*img/
-│ └── {group-id}/
-│ └── clip*{subgroup-id}/
-│ └── {group-id}-{img-id}.jpg
-└── matting/
-└── {group-id}/
-└── matting\_{subgroup-id}/
-└── {group-id}-{img-id}.png
+    ├── clip_img/
+    │   └── {group-id}/
+    │       └── clip_{subgroup-id}/
+    │               └── {group-id}-{img-id}.jpg
+    └── matting/
+        └── {group-id}/
+            └── matting_{subgroup-id}/
+                └── {group-id}-{img-id}.png
 ```
 
 The input `data/clip_img/1803151818/clip_00000000/1803151818-00000003.jpg` matches the label `data/matting/1803151818/matting_00000000/1803151818-00000003.png`