YueBro

ORCNNROIHeads raises error if input "proposes" is empty. (when batch size changed to 1)

1

**Issue** When I changed the batch_size from 2 to 1 for reducing memory usage, an error occurred in `ORCNNROIHeads` class at adet/modeling/rcnn/rcnn_heads.py line 508 `gt_occludeds = cat(gt_occludeds, dim=0).to(torch.int64)`. I suspect...