Vasiliy Adeshkin

@zhangyunming I have same problem. Do you have any ideas of solution?

@cjfcsjt I've just added [here](https://github.com/WXinlong/SOLO/blob/master/mmdet/models/anchor_heads/solov2_head.py#L336): ``` if len(ins_label) == 0: ins_label.append(torch.zeros([mask_feat_size[0], mask_feat_size[1]], dtype=torch.uint8, device=device)) label = 0 ins_ind_label[label] = True grid_order.append(label) ins_label = torch.stack(ins_label, 0) ```