fix benchmark

[yhcao6]

Fix #3552

[codecov]

Codecov Report

Merging #3606 into master will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3606      +/-   ##
==========================================
+ Coverage   60.67%   60.77%   +0.10%     
==========================================
  Files         205      205              
  Lines       13781    13781              
  Branches     2332     2332              
==========================================
+ Hits         8362     8376      +14     
+ Misses       4995     4981      -14     
  Partials      424      424              

Flag	Coverage Δ
#unittests	60.77% <ø> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
mmdet/models/dense_heads/corner_head.py	76.04% <0.00%> (+1.94%)	⬆️
mmdet/models/detectors/cornernet.py	100.00% <0.00%> (+5.12%)	⬆️
mmdet/models/roi_heads/test_mixins.py	53.76% <0.00%> (+5.37%)	⬆️

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