[Refactor] refactor multiview humanpose

[wusize]

Motivation

Re-organize the framework of VoxelPose into a more general detect-and-regress approach.

Modification

mmpose/models/detectors/multiview_pose.py
tests/test_models/test_multiview_pose.py

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

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

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✅ liqikai9
❌ wusize

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[codecov]

Codecov Report

Merging #1196 (87ff3e9) into master (4b4822c) will increase coverage by 0.75%.
The diff coverage is 69.14%.

@@            Coverage Diff             @@
##           master    #1196      +/-   ##
==========================================
+ Coverage   82.25%   83.01%   +0.75%     
==========================================
  Files         204      204              
  Lines       16193    16192       -1     
  Branches     2891     2892       +1     
==========================================
+ Hits        13319    13441     +122     
+ Misses       2143     2012     -131     
- Partials      731      739       +8     

Flag	Coverage Δ
unittests	82.94% <69.14%> (+0.75%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmpose/models/detectors/multiview_pose.py	69.04% <67.85%> (ø)
mmpose/models/detectors/__init__.py	100.00% <100.00%> (ø)
mmpose/models/heads/voxelpose_head.py	100.00% <100.00%> (+2.98%)	⬆️
mmpose/core/visualization/__init__.py	100.00% <0.00%> (ø)
mmpose/datasets/pipelines/shared_transform.py	81.57% <0.00%> (+0.43%)	⬆️
mmpose/core/distributed_wrapper.py	42.10% <0.00%> (+4.96%)	⬆️
mmpose/core/visualization/effects.py	90.00% <0.00%> (+47.30%)	⬆️

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[jin-s13]

Need more detailed code comments.

[liqikai9]

The config should be consistent with the model definition, for example, the type of model here should be DetectAndRegress instead of VoxelPose. Check other fields that need to be modified.

[ly015]

@wusize @jin-s13 The codecov rate is below the target. Do we need to work on it?

[jin-s13]

@wusize @jin-s13 The codecov rate is below the target. Do we need to work on it?

I think this PR can be merged, as codecov/project look good.