[Feature] Support styleclip

[plyfager]

Support StyleClip application.

[codecov]

Codecov Report

Merging #236 (6f7a959) into master (40376b4) will decrease coverage by 0.52%.
The diff coverage is 54.20%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   76.75%   76.22%   -0.53%     
==========================================
  Files         130      134       +4     
  Lines        9421     9633     +212     
  Branches     1899     1931      +32     
==========================================
+ Hits         7231     7343     +112     
- Misses       1726     1823      +97     
- Partials      464      467       +3     

Flag	Coverage Δ
unittests	76.22% <54.20%> (-0.53%)	⬇️

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Impacted Files	Coverage Δ
mmgen/models/losses/gen_auxiliary_loss.py	45.18% <22.38%> (-22.94%)	⬇️
mmgen/models/architectures/arcface/id_loss.py	28.94% <28.94%> (ø)
mmgen/models/architectures/arcface/model_irse.py	71.11% <71.11%> (ø)
mmgen/models/architectures/arcface/helpers.py	90.00% <90.00%> (ø)
mmgen/models/architectures/__init__.py	100.00% <100.00%> (ø)
mmgen/models/architectures/arcface/__init__.py	100.00% <100.00%> (ø)
mmgen/models/losses/__init__.py	100.00% <100.00%> (ø)
...chitectures/stylegan/generator_discriminator_v2.py	86.66% <0.00%> (-1.12%)	⬇️

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