[fbsync] Add default info dictionary to dataset (#9107)

Reviewed By: Dan-Flores

Differential Revision: D79175060

fbshipit-source-id: 69562d2d3f3f1a6f7f8a28ec43e63622fad7419a

Author: NicolasHug

references/detection/coco_utils.py

@@ -123,7 +123,7 @@ def convert_to_coco_api(ds):
     coco_ds = COCO()
     # annotation IDs need to start at 1, not 0, see torchvision issue #1530
     ann_id = 1
-    dataset = {"images": [], "categories": [], "annotations": []}
+    dataset = {"images": [], "categories": [], "annotations": [], "info": {}}
     categories = set()
     for img_idx in range(len(ds)):
         # find better way to get target