recursively remove pretrained step for testing

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #695 (22bded5) into master (ee34d95) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #695      +/-   ##
==========================================
- Coverage   84.64%   84.59%   -0.05%     
==========================================
  Files         130      130              
  Lines        9346     9357      +11     
  Branches     1575     1578       +3     
==========================================
+ Hits         7911     7916       +5     
- Misses       1038     1042       +4     
- Partials      397      399       +2     

Flag	Coverage Δ
unittests	84.58% <ø> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
mmaction/models/backbones/resnet3d_slowfast.py	82.65% <0.00%> (-1.96%)	⬇️
mmaction/models/recognizers/base.py	64.54% <0.00%> (+0.46%)	⬆️

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