AVA+Context

[kennymckormick]

Add an AVA trick: use both RoI feature and context feature for recognition.
About 1% improvement in Top-1

[codecov]

Codecov Report

Merging #471 (c3df36e) into master (4df447b) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
- Coverage   84.69%   84.69%   -0.01%     
==========================================
  Files         118      118              
  Lines        8344     8357      +13     
  Branches     1366     1366              
==========================================
+ Hits         7067     7078      +11     
- Misses        930      932       +2     
  Partials      347      347              

Flag	Coverage Δ
unittests	84.68% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
...maction/models/roi_extractors/single_straight3d.py	84.90% <100.00%> (-0.47%)	⬇️
mmaction/core/evaluation/accuracy.py	93.18% <0.00%> (+0.03%)	⬆️

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