[Enhancement]Support CPU Train/Inference

[MeowZheng]

ref: open-mmlab/mmcv#1621 and open-mmlab/mmdetection#7016

[codecov]

Codecov Report

Merging #86 (8f07c42) into master (198748d) will increase coverage by 0.31%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
+ Coverage   67.65%   67.96%   +0.31%     
==========================================
  Files          86       86              
  Lines        4888     4895       +7     
  Branches      704      705       +1     
==========================================
+ Hits         3307     3327      +20     
+ Misses       1474     1460      -14     
- Partials      107      108       +1     

Flag	Coverage Δ
unittests	67.96% <37.50%> (+0.31%)	⬆️

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Impacted Files	Coverage Δ
mmflow/apis/train.py	21.27% <37.50%> (+1.73%)	⬆️
mmflow/utils/misc.py	95.23% <0.00%> (-4.77%)	⬇️
mmflow/datasets/pipelines/transforms.py	79.33% <0.00%> (+3.00%)	⬆️

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