[Enchancement] Add multi-processes script

[MengzhangLI]

No description provided.

[codecov]

Codecov Report

Merging #1238 (d1c2035) into master (4b905cb) will decrease coverage by 0.02%.
The diff coverage is 85.29%.

@@            Coverage Diff             @@
##           master    #1238      +/-   ##
==========================================
- Coverage   90.24%   90.22%   -0.03%     
==========================================
  Files         128      129       +1     
  Lines        7464     7497      +33     
  Branches     1241     1249       +8     
==========================================
+ Hits         6736     6764      +28     
- Misses        524      526       +2     
- Partials      204      207       +3     

Flag	Coverage Δ
unittests	90.22% <85.29%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
mmseg/utils/set_env.py	84.37% <84.37%> (ø)
mmseg/utils/__init__.py	100.00% <100.00%> (ø)

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