add option to filter empty annotations

Summary: Add option for controlling empty annotation filtering.

Reviewed By: zhanghang1989

Differential Revision: D34365265

fbshipit-source-id: 261c6879636f19138de781098f47dee4909de9e7

d2go/data/extended_coco.py

@@ -249,6 +249,7 @@ def convert_to_dict_list(
     anns: List[Dict],
     dataset_name: Optional[str] = None,
     image_direct_copy_keys: Optional[List[str]] = None,
+    filter_empty_annotations: Optional[bool] = True,
 ) -> List[Dict]:
 
     ann_error_report = {
@@ -263,7 +264,10 @@ def convert_to_dict_list(
         name: ErrorEntry(name, msg, 0)
         for name, msg in [
             ("ignore_image_root", f"Image root ignored {image_root}"),
-            ("no_annotations", "Image filtered"),
+            (
+                "no_annotations",
+                "Image filtered" if filter_empty_annotations else "Warning",
+            ),
         ]
     }
     ex_warning_fn = None
@@ -299,7 +303,8 @@ def convert_to_dict_list(
         )
         if len(converted_anns) == 0:
             image_error_report["no_annotations"].cnt += 1
-            continue
+            if filter_empty_annotations:
+                continue
         record["annotations"] = converted_anns
 
         # Copy keys if additionally asked
@@ -352,6 +357,7 @@ def extended_coco_load(
     dataset_name: Optional[str] = None,
     loaded_json: Optional[str] = None,
     image_direct_copy_keys: List[str] = None,
+    filter_empty_annotations: Optional[bool] = True,
 ) -> List[Dict]:
     """
     Load a json file with COCO's annotation format.
@@ -419,6 +425,7 @@ def extended_coco_load(
         anns,
         dataset_name,
         image_direct_copy_keys=image_direct_copy_keys,
+        filter_empty_annotations=filter_empty_annotations,
     )
 
 

tests/data/test_d2go_datasets.py

@@ -86,6 +86,7 @@ class TestD2GoDatasets(unittest.TestCase):
         img_list = [
             {"id": 0, "width": 50, "height": 50, "file_name": "a.png"},
             {"id": 1, "width": 50, "height": 50, "file_name": "b.png"},
+            {"id": 2, "width": 50, "height": 50, "file_name": "b.png"},
         ]
         ann_list = [
             [
@@ -140,17 +141,18 @@ class TestD2GoDatasets(unittest.TestCase):
                     "bbox": [0, 0, 0, 0],
                 },
             ],
+            [],
         ]
 
-        out_dict_list = extended_coco.convert_to_dict_list(
-            "",
-            [0],
-            img_list,
-            ann_list,
-        )
+        out_dict_list = extended_coco.convert_to_dict_list("", [0], img_list, ann_list)
         self.assertEqual(len(out_dict_list), 1)
         self.assertEqual(len(out_dict_list[0]["annotations"]), 1)
 
+        out_dict_list = extended_coco.convert_to_dict_list(
+            "", [0], img_list, ann_list, filter_empty_annotations=False
+        )
+        self.assertEqual(len(out_dict_list), 3)
+
     @tempdir
     def test_coco_injection(self, tmp_dir):
         image_dir, json_file = create_test_images_and_dataset_json(tmp_dir)