[Fix] compatible with new mmcls

[kennymckormick]

No description provided.

[codecov]

Codecov Report

Merging #1139 (eadf73e) into master (fa707f9) will decrease coverage by 0.02%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master    #1139      +/-   ##
==========================================
- Coverage   83.21%   83.19%   -0.03%     
==========================================
  Files         135      135              
  Lines       10383    10388       +5     
  Branches     1780     1782       +2     
==========================================
+ Hits         8640     8642       +2     
- Misses       1313     1314       +1     
- Partials      430      432       +2     

Flag	Coverage Δ
unittests	83.19% <80.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
mmaction/models/recognizers/base.py	68.38% <80.00%> (+0.38%)	⬆️
mmaction/core/evaluation/accuracy.py	92.76% <0.00%> (-0.86%)	⬇️

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