New Features

• Support TOOD: Task-aligned One-stage Object Detection (ICCV 2021 Oral) (#6746)
• Support resuming from the latest checkpoint automatically (#6727)

Bug Fixes

• Fix wrong bbox loss_weight of the PAA head (#6744)
• Fix the padding value of gt_semantic_seg in batch collating (#6837)
• Fix test error of lvis when using classwise (#6845)
• Avoid BC-breaking of get_local_path (#6719)
• Fix bug in sync_norm_hook when the BN layer does not exist (#6852)
• Use pycocotools directly no matter what platform it is (#6838)

Improvements

• Add unit test for SimOTA with no valid bbox (#6770)
• Use precommit to check readme (#6802)
• Support selecting GPU-ids in non-distributed testing time (#6781)

Contributors

A total of 16 developers contributed to this release. Thanks @ZwwWayne, @Czm369, @jshilong, @RangiLyu, @BIGWangYuDong, @hhaAndroid, @jamiechoi1995, @AronLin, @Keiku, @gkagkos, @fcakyon, @www516717402, @vansin, @zactodd, @kimnamu, @jenhaoyang

New Contributors

• @jamiechoi1995 made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6795
• @Keiku made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6865
• @gkagkos made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6744
• @vansin made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6858
• @zactodd made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6764
• @kimnamu made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6906
• @jenhaoyang made their first contribution in https://github.com/open-mmlab/mmdetection/pull/6881

Full Changelog: https://github.com/open-mmlab/mmdetection/compare/v2.19.1...v2.20.0