Fix magnitude_std bug in RandAugment, and update unit tests.

[mzr1996]

No description provided.

[codecov]

Codecov Report

Merging #309 (fda056b) into master (5066e32) will decrease coverage by 0.54%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #309      +/-   ##
==========================================
- Coverage   73.30%   72.75%   -0.55%     
==========================================
  Files          88       88              
  Lines        4611     4603       -8     
  Branches      805      782      -23     
==========================================
- Hits         3380     3349      -31     
- Misses       1129     1161      +32     
+ Partials      102       93       -9     

Flag	Coverage Δ
unittests	72.75% <100.00%> (-0.55%)	⬇️

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

Impacted Files	Coverage Δ
mmcls/datasets/pipelines/auto_augment.py	78.78% <100.00%> (+0.44%)	⬆️
mmcls/models/backbones/base_backbone.py	88.88% <0.00%> (-5.56%)	⬇️
mmcls/models/backbones/shufflenet_v2.py	90.35% <0.00%> (-5.49%)	⬇️
mmcls/models/heads/multi_label_linear_head.py	64.51% <0.00%> (-5.19%)	⬇️
mmcls/models/heads/multi_label_head.py	64.51% <0.00%> (-2.16%)	⬇️
mmcls/models/classifiers/base.py	30.52% <0.00%> (-1.80%)	⬇️
mmcls/models/heads/cls_head.py	70.73% <0.00%> (-1.77%)	⬇️
mmcls/models/heads/linear_head.py	54.83% <0.00%> (-1.42%)	⬇️
mmcls/models/heads/vision_transformer_head.py	66.66% <0.00%> (-0.84%)	⬇️
mmcls/models/classifiers/image.py	83.72% <0.00%> (-0.60%)	⬇️
... and 14 more

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[ycxioooong]

LGTM