add idx return

CustomAnchorShape.py

@@ -134,8 +134,8 @@ class CustomAnchorShapeDataset(datasets.GeneratorBasedBuilder):
             custom_data=custom_data,
         )
         
-        for i, data in enumerate(custom_shape.custom_data):
-            yield {
+        for idx, data in enumerate(custom_shape.custom_data):
+            yield idx, {
                 # 'image_id': i,
                 'image': custom_shape.get_distribution(data, type='img'),
                 # 'width': width,