MMCV Release V1.3.9

New Features

• Support building MMCV with ROCm (#1022)
• Support tensorrt custom plugin MMCVCornerPool (#1179)

Improvements

• Use LooseVersion for version checking (#1158)
• Refactor structure of documentation (#1102)
• Build Chinese documentation (#1073)

Bug Fixes

• Fix SyncBN in PyTorch 1.9 (#1138)
• Fix saconv in PyTorch 1.9 (#1147)
• Fix unittest in PyTorch 1.9 (#1146)
• Fix missing check of directory in scandir (#1110)
• Change dict update order to fix bug of resumed checkpoint (#1108)