add tpfp func in evaluating AP

[Johnson-Wang]

No description provided.

[codecov]

Codecov Report

Merging #4069 (398e24e) into master (9ee13ab) will increase coverage by 0.19%.
The diff coverage is 64.40%.

@@            Coverage Diff             @@
##           master    #4069      +/-   ##
==========================================
+ Coverage   61.57%   61.77%   +0.19%     
==========================================
  Files         216      225       +9     
  Lines       15514    16644    +1130     
  Branches     2634     2816     +182     
==========================================
+ Hits         9553    10281     +728     
- Misses       5483     5863     +380     
- Partials      478      500      +22     

Flag	Coverage Δ
unittests	61.73% <64.40%> (+0.20%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/core/anchor/anchor_generator.py	78.98% <ø> (+1.44%)	⬆️
mmdet/core/bbox/samplers/random_sampler.py	75.00% <0.00%> (-6.82%)	⬇️
mmdet/core/bbox/samplers/score_hlr_sampler.py	81.73% <0.00%> (-2.19%)	⬇️
mmdet/core/bbox/transforms.py	60.86% <0.00%> (ø)
mmdet/core/utils/misc.py	100.00% <ø> (+33.33%)	⬆️
mmdet/datasets/cityscapes.py	12.25% <0.00%> (-0.58%)	⬇️
mmdet/models/dense_heads/anchor_free_head.py	75.59% <ø> (-0.38%)	⬇️
mmdet/models/dense_heads/atss_head.py	27.94% <0.00%> (-0.51%)	⬇️
mmdet/models/dense_heads/corner_head.py	74.86% <ø> (+0.54%)	⬆️
mmdet/models/dense_heads/dense_test_mixins.py	13.63% <0.00%> (-1.37%)	⬇️
... and 79 more

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