[Feature] JHMDB preparation

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #220 into master will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   84.36%   84.46%   +0.10%     
==========================================
  Files          78       78              
  Lines        4956     4956              
  Branches      783      783              
==========================================
+ Hits         4181     4186       +5     
+ Misses        644      642       -2     
+ Partials      131      128       -3     

Flag	Coverage Δ
#unittests	84.46% <ø> (+0.10%)	⬆️

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

Impacted Files	Coverage Δ
mmaction/core/evaluation/accuracy.py	94.87% <0.00%> (+2.56%)	⬆️

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[innerlee]

need to rebase master