Handling of crowd images in coco #360
Description
In coco some frames are crowded which results in partial and inconsistent labeling: all persons are not labeled and in the case of segmentation instances are not always separated.
Here is what it may looks like if we want boxes2d in cocopanoptic:
In cases like this I think that a way to skip crowded images would be the best solution but just adding a flag might be easier.