[Feature] Sync the seed in diff ranks.

[yingfhu]

Motivation

This is an implantation from MMDet #7432 and #7440.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Merging #744 (0d473cc) into dev (a19c28f) will decrease coverage by 0.04%.
The diff coverage is 70.83%.

@@            Coverage Diff             @@
##              dev     #744      +/-   ##
==========================================
- Coverage   85.15%   85.11%   -0.05%     
==========================================
  Files         124      124              
  Lines        7672     7690      +18     
  Branches     1325     1328       +3     
==========================================
+ Hits         6533     6545      +12     
- Misses        946      951       +5     
- Partials      193      194       +1     

Flag	Coverage Δ
unittests	85.01% <70.83%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
mmcls/datasets/builder.py	91.04% <ø> (ø)
mmcls/core/utils/dist_utils.py	32.07% <60.00%> (+8.99%)	⬆️
mmcls/datasets/samplers/repeat_aug.py	90.90% <75.00%> (+0.43%)	⬆️
mmcls/core/utils/__init__.py	100.00% <100.00%> (ø)
mmcls/datasets/samplers/distributed_sampler.py	85.18% <100.00%> (+1.18%)	⬆️

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[mzr1996]

Looks good