[Improvement] Improve Metafiles

[kennymckormick]

No description provided.

[dreamerlin]

@zhouzaida has a look

[codecov]

Codecov Report

Merging #956 (cc820b4) into master (d92fcc6) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head cc820b4 differs from pull request most recent head 9d07612. Consider uploading reports for the commit 9d07612 to get more accurate results

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
- Coverage   83.71%   83.70%   -0.02%     
==========================================
  Files         132      132              
  Lines        9983     9983              
  Branches     1722     1722              
==========================================
- Hits         8357     8356       -1     
- Misses       1210     1211       +1     
  Partials      416      416              

Flag	Coverage Δ
unittests	83.70% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
mmaction/core/evaluation/accuracy.py	92.27% <0.00%> (-0.91%)	⬇️
mmaction/datasets/pipelines/augmentations.py	92.98% <0.00%> (+0.11%)	⬆️

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[zhouzaida]

LGTM