[Fix] Fix default value for dataset_setting

[dreamerlin]

No description provided.

[codecov]

Codecov Report

Merging #245 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #245      +/-   ##
==========================================
+ Coverage   84.98%   85.08%   +0.09%     
==========================================
  Files          81       81              
  Lines        5276     5276              
  Branches      849      849              
==========================================
+ Hits         4484     4489       +5     
+ Misses        650      648       -2     
+ Partials      142      139       -3     

Flag	Coverage Δ
#unittests	85.08% <ø> (+0.09%)	⬆️

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Impacted Files	Coverage Δ
mmaction/apis/train.py	19.04% <ø> (ø)
mmaction/core/evaluation/accuracy.py	94.87% <0.00%> (+2.56%)	⬆️

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