Add SSN dataset.

[JackyTown]

No description provided.

[codecov]

Codecov Report

Merging #37 into master will increase coverage by 0.81%.
The diff coverage is 93.57%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   84.21%   85.02%   +0.81%     
==========================================
  Files          73       75       +2     
  Lines        4175     4588     +413     
  Branches      638      729      +91     
==========================================
+ Hits         3516     3901     +385     
- Misses        554      564      +10     
- Partials      105      123      +18     

Flag	Coverage Δ
#unittests	85.02% <93.57%> (+0.81%)	⬆️

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

Impacted Files	Coverage Δ
mmaction/core/evaluation/accuracy.py	92.30% <88.33%> (-2.02%)	⬇️
mmaction/datasets/ssn_dataset.py	93.45% <93.45%> (ø)
mmaction/core/evaluation/__init__.py	100.00% <100.00%> (ø)
mmaction/datasets/__init__.py	100.00% <100.00%> (ø)
mmaction/datasets/pipelines/loading.py	94.11% <100.00%> (-0.02%)	⬇️
mmaction/localization/__init__.py	100.00% <100.00%> (ø)
mmaction/localization/ssn_utils.py	100.00% <100.00%> (ø)
mmaction/models/localizers/base.py	33.33% <0.00%> (-4.17%)	⬇️
mmaction/models/recognizers/base.py	60.81% <0.00%> (-2.01%)	⬇️
mmaction/datasets/base.py	67.24% <0.00%> (-1.10%)	⬇️
... and 5 more

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[innerlee]

Does overlap_self has other candidate names? The self is very broad

[JackyTown]

I don't know, they use 'overlap_self' in mmaction1...

[innerlee]

I think we can change it to something meaningful