Add include_bkg in ClassBalancedDataset

[Johnson-Wang]

No description provided.

[codecov]

Codecov Report

Merging #3577 into master will increase coverage by 1.38%.
The diff coverage is 69.64%.

@@            Coverage Diff             @@
##           master    #3577      +/-   ##
==========================================
+ Coverage   59.04%   60.42%   +1.38%     
==========================================
  Files         205      205              
  Lines       13731    13702      -29     
  Branches     2315     2331      +16     
==========================================
+ Hits         8107     8280     +173     
+ Misses       5248     4999     -249     
- Partials      376      423      +47     

Flag	Coverage Δ
#unittests	60.42% <69.64%> (+1.38%)	⬆️

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

Impacted Files	Coverage Δ
mmdet/core/evaluation/eval_hooks.py	27.02% <ø> (ø)
mmdet/datasets/custom.py	51.42% <ø> (+15.71%)	⬆️
mmdet/models/roi_heads/bbox_heads/bbox_head.py	84.76% <0.00%> (-0.30%)	⬇️
mmdet/datasets/builder.py	59.72% <66.66%> (+28.37%)	⬆️
mmdet/models/detectors/base.py	47.96% <66.66%> (-3.18%)	⬇️
mmdet/datasets/dataset_wrappers.py	80.83% <71.73%> (-0.18%)	⬇️
mmdet/models/roi_heads/mask_scoring_roi_head.py	81.57% <0.00%> (-18.43%)	⬇️
mmdet/core/bbox/coder/base_bbox_coder.py	62.50% <0.00%> (-7.50%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	92.30% <0.00%> (-5.57%)	⬇️
mmdet/models/roi_heads/base_roi_head.py	76.31% <0.00%> (-3.69%)	⬇️
... and 33 more

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