[Refactor] refactor final layer in heads

[Ben-Louis]

Motivation

Modification

replace the has_final_layer argument with the final_layer argument, which is a dictionary containing the parameters for the final conv2d layer.

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.

[codecov]

Codecov Report

Patch coverage: 69.23% and project coverage change: -0.04 ⚠️

Comparison is base (b1876b8) 82.34% compared to head (5003fee) 82.30%.

❗ Current head 5003fee differs from pull request most recent head fdd23aa. Consider uploading reports for the commit fdd23aa to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2126      +/-   ##
===========================================
- Coverage    82.34%   82.30%   -0.04%     
===========================================
  Files          227      227              
  Lines        13340    13335       -5     
  Branches      2261     2257       -4     
===========================================
- Hits         10985    10976       -9     
- Misses        1844     1850       +6     
+ Partials       511      509       -2     

Flag	Coverage Δ
unittests	82.30% <69.23%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/models/heads/heatmap_heads/ae_head.py	82.65% <ø> (ø)
mmpose/models/heads/regression_heads/dsnt_head.py	86.48% <ø> (ø)
...heads/regression_heads/integral_regression_head.py	76.19% <33.33%> (-0.61%)	⬇️
mmpose/models/heads/coord_cls_heads/simcc_head.py	90.38% <50.00%> (+0.09%)	⬆️
mmpose/models/heads/heatmap_heads/cpm_head.py	93.63% <100.00%> (+0.05%)	⬆️
mmpose/models/heads/heatmap_heads/heatmap_head.py	87.50% <100.00%> (+5.01%)	⬆️
mmpose/models/heads/heatmap_heads/vipnas_head.py	88.13% <100.00%> (+0.20%)	⬆️

... and 2 files with indirect coverage changes

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[Tau-J]

Have you verified the test accuracy?

[Ben-Louis]

Yeah, I have verified the test accuracy of ViTPose-small and CPM on COCO