Add slowonly finetune setting

[kennymckormick]

ckpts have not been uploaded

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #173 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
- Coverage   85.89%   85.87%   -0.03%     
==========================================
  Files          77       77              
  Lines        4849     4849              
  Branches      765      765              
==========================================
- Hits         4165     4164       -1     
  Misses        559      559              
- Partials      125      126       +1     

Flag	Coverage Δ
#unittests	85.87% <100.00%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
mmaction/models/backbones/resnet.py	94.66% <ø> (ø)
mmaction/models/backbones/resnet3d.py	89.69% <ø> (ø)
mmaction/apis/inference.py	81.81% <100.00%> (ø)
mmaction/models/backbones/resnet3d_csn.py	97.36% <0.00%> (-2.64%)	⬇️

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[kennymckormick]

@dreamerlin ready