fix bugs

app.py

@@ -22,11 +22,11 @@ hourglass_args = {
     },
 }
 
-def predict(image, speed_mode, point_per_side):
+def predict(image, speed_mode, points_per_side):
     mask_generator = SamAutomaticMaskGenerator(
         build_sam(checkpoint="sam_vit_h_4b8939.pth", hourglass_kwargs=hourglass_args[speed_mode]), 
-        point_per_side=point_per_side,
-        points_per_batch=64 if point_per_side > 12 else point_per_side * point_per_side
+        points_per_side=points_per_side,
+        points_per_batch=64 if points_per_side > 12 else points_per_side * points_per_side
     )
     masks = mask_generator.generate(image)