polish(pu): polish comments and styles in files within torch_utils/network

[puyuan1996]

Description

• polish the comments and code styles in the files located within the ding/torch_utils/network/ directory.

Related Issue

TODO

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ac9fa76) 77.10% compared to head (174370d) 77.07%.

❗ Current head 174370d differs from pull request most recent head df2fe3e. Consider uploading reports for the commit df2fe3e to get more accurate results

Files	Patch %	Lines
ding/torch_utils/network/resnet.py	96.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #745      +/-   ##
==========================================
- Coverage   77.10%   77.07%   -0.03%     
==========================================
  Files         671      671              
  Lines       53775    53774       -1     
==========================================
- Hits        41461    41448      -13     
- Misses      12314    12326      +12     

Flag	Coverage Δ
unittests	77.07% <98.07%> (-0.03%)	⬇️

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