Add CSN model

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #87 into master will increase coverage by 0.53%.
The diff coverage is 93.90%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   84.90%   85.44%   +0.53%     
==========================================
  Files          73       76       +3     
  Lines        3889     4122     +233     
  Branches      632      660      +28     
==========================================
+ Hits         3302     3522     +220     
- Misses        485      493       +8     
- Partials      102      107       +5     

Flag	Coverage Δ
#unittests	85.44% <93.90%> (+0.53%)	⬆️

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

Impacted Files	Coverage Δ
mmaction/datasets/pipelines/__init__.py	100.00% <ø> (ø)
mmaction/models/backbones/resnet3d.py	89.69% <ø> (ø)
mmaction/models/losses/ohem_hinge_loss.py	75.75% <75.75%> (ø)
mmaction/datasets/pipelines/formating.py	93.85% <85.71%> (+0.34%)	⬆️
mmaction/datasets/rawframe_dataset.py	87.36% <95.23%> (+2.00%)	⬆️
mmaction/datasets/pipelines/loading.py	93.79% <96.62%> (+0.70%)	⬆️
mmaction/models/backbones/resnet3d_csn.py	97.36% <97.36%> (ø)
mmaction/models/losses/ssn_loss.py	98.14% <98.14%> (ø)
mmaction/models/__init__.py	100.00% <100.00%> (ø)
mmaction/models/backbones/__init__.py	100.00% <100.00%> (ø)
... and 5 more

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