Iteration Plan v1.3.13 - Sep 2021

[zhouzaida]

MMCV v1.3.12 has been released, see the release notes
We list our plan for v1.3.13, which will be released on September 9th.
The PRs from the communities will also be listed here.
Thus, developers could comprehensively know the plan and the progress.

Features:

• Add DCN and Modulated DCN CPU implementation #1278
• [Feature]: Support empty tensor in MMSyncBN #1205
• [Feature] Add revert_sync_batchnorm #1253

Enhancements:

• [Fix] Restrict the warning message #1267
• [Enhancement] Add build_func for UPSAMPLE_LAYERS #1272
• Reimplement cc_attention using pure pytorch #1201

Documentations:

• translation of faq.md #1251
• [Docs] cnn.md translated #1246
• [Docs] Translate understand_mmcv about registry.md and fix config.md #1204
• [Docs] Fix the version of sphinx #1301

Fixes:

• fix MultiScaleDeformableAttention inference issue on cpu model #1223
• [Fix] Fix missing state_dict._metadata when saving and loading checkpoints. #1294
• [Fix] Fix the weight initialization of deform conv #1262
• Fix typo on pip install mmcv-full torch1.9 cpu  #1313

Others:

• [Feature] Add python3.9 in CI #1291
• Add citation #1303

If you have created a PR and wish it to be merged in this version, feel free to leave a message in this issue. We will update our plan accordingly here.