[Improvement] Return features during inference

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #458 (af09aec) into master (777546f) will increase coverage by 0.08%.
The diff coverage is 92.72%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
+ Coverage   84.65%   84.73%   +0.08%     
==========================================
  Files         118      120       +2     
  Lines        8348     8407      +59     
  Branches     1365     1373       +8     
==========================================
+ Hits         7067     7124      +57     
- Misses        933      935       +2     
  Partials      348      348              

Flag	Coverage Δ
unittests	84.72% <92.72%> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
mmaction/apis/inference.py	80.95% <84.61%> (-0.87%)	⬇️
mmaction/core/hooks/output.py	94.87% <94.87%> (ø)
mmaction/core/__init__.py	100.00% <100.00%> (ø)
mmaction/core/hooks/__init__.py	100.00% <100.00%> (ø)
mmaction/core/evaluation/accuracy.py	93.18% <0.00%> (+0.90%)	⬆️
...maction/models/roi_extractors/single_straight3d.py	84.90% <0.00%> (+3.08%)	⬆️

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[dreamerlin]

This PR should be merged after #459