Reimplement Deformable-detr

[jshilong]

No description provided.

[ZwwWayne]

Last round, can be merged after comments are resolved.

[ZwwWayne]

resolve conflicts

[codecov]

Codecov Report

Merging #4778 (c08fb44) into master (0425fb6) will decrease coverage by 0.51%.
The diff coverage is 34.25%.

❗ Current head c08fb44 differs from pull request most recent head a19c7f0. Consider uploading reports for the commit a19c7f0 to get more accurate results

@@            Coverage Diff             @@
##           master    #4778      +/-   ##
==========================================
- Coverage   66.03%   65.52%   -0.52%     
==========================================
  Files         261      263       +2     
  Lines       20306    20633     +327     
  Branches     3466     3523      +57     
==========================================
+ Hits        13410    13519     +109     
- Misses       6156     6375     +219     
+ Partials      740      739       -1     

Flag	Coverage Δ
unittests	65.48% <34.25%> (-0.52%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/models/utils/__init__.py	100.00% <ø> (ø)
mmdet/models/utils/transformer.py	48.07% <24.00%> (-38.30%)	⬇️
mmdet/models/dense_heads/deformable_detr_head.py	41.60% <41.60%> (ø)
mmdet/models/dense_heads/detr_head.py	89.44% <50.00%> (+0.66%)	⬆️
mmdet/models/necks/channel_mapper.py	79.41% <53.33%> (-4.80%)	⬇️
mmdet/models/dense_heads/__init__.py	100.00% <100.00%> (ø)
mmdet/models/detectors/__init__.py	100.00% <100.00%> (ø)
mmdet/models/detectors/deformable_detr.py	100.00% <100.00%> (ø)
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/dense_heads/corner_head.py	73.72% <0.00%> (-1.88%)	⬇️
... and 4 more

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