Add CID to mmpose

[kennethwdk]

Motivation

Integrate CID (CVPR2022) into mmpose.

Modification

Modify dataset to add 'bbox' and 'area' into db_rec Modify pipeline to support transformation of 'bbox' and add CID target generator Add CID detector and head and configs. The code is adapted from here

The log and weights re-trained by mmpose are provided at here

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• [x] I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• [x] Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• [x] Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• [x] New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• [x] The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• [ ] CLA has been signed and all committers have signed the CLA in this PR.

[CLAassistant]

All committers have signed the CLA.

[jin-s13]

Thanks a lot for your contributions! We will review the codes ASAP.

[jin-s13]

Could you please follow the instructions here to setup the pre-commit? @kennethwdk

[jin-s13]

BTW, would you mind adding some unit tests for CID? You may refer to https://github.com/open-mmlab/mmpose/blob/master/tests/test_models/test_bottom_up_forward.py as an example.

[kennethwdk]

Hello, I have created new commits to add the forward test, moving the losses and use pre-commit to check code styles.

[Ben-Louis]

Hi, we retrain the CID model and get better performance.

Arch	Input Size	AP	AP50	AP75	AR	AR50
CID	512x512	0.702	0.887	0.768	0.755	0.926

The corresponding markdown file has been updated

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