[Fix] Use underline for required aruments in python files.

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #822 (54c9101) into master (091348d) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
+ Coverage   83.06%   83.07%   +0.01%     
==========================================
  Files         219      219              
  Lines       12285    12285              
  Branches     1984     1984              
==========================================
+ Hits        10204    10206       +2     
+ Misses       1769     1768       -1     
+ Partials      312      311       -1     

Flag	Coverage Δ
unittests	83.03% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️

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[wangruohui]

Fix bug introduced by #808