[Feature]: Add diff seeds to diff ranks and set torch seed in worker_…

[RockeyCoss]

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Motivation

Add diff seeds to diff ranks and set torch seed in worker_init_fn
Related PR：open-mmlab/mmselfsup#228

Modification

Add diff seeds to diff ranks and set torch seed in worker_init_fn

[Junjun2016]

Hi @RockeyCoss
Could add the related PR to PR message instead of the doc in feishu.

[MengzhangLI]

For example: #1296.

Only need to add related PR of other codebase.

[codecov]

Codecov Report

Merging #1362 (dee8e1a) into master (66b3790) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1362      +/-   ##
==========================================
- Coverage   90.32%   90.31%   -0.02%     
==========================================
  Files         132      132              
  Lines        7702     7703       +1     
  Branches     1290     1290              
==========================================
  Hits         6957     6957              
- Misses        531      532       +1     
  Partials      214      214              

Flag	Coverage Δ
unittests	90.31% <0.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
mmseg/datasets/builder.py	86.74% <0.00%> (-1.06%)	⬇️

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[Junjun2016]

Could update related docs.
Refer to open-mmlab/mmocr#820 (review).