lixuan

I have prepared a custom instance segmentation dataset, which contains 5 classes (not counting background). It worked fine on original MMDetection framework training (such as: detectoRS, mask-RCNN, HTC), but when...

### Checklist - [X] 1. I have searched related issues but cannot get the expected help. - [X] 2. The bug has not been fixed in the latest version. ###...