[Feature] Add experiments and README for fp16 stylegan2 in ffhq-256

[nbei]

No description provided.

[codecov-commenter]

Codecov Report

Merging #20 (60e31da) into master (6145c26) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #20   +/-   ##
=======================================
  Coverage   76.23%   76.23%           
=======================================
  Files         107      107           
  Lines        6383     6383           
  Branches     1115     1115           
=======================================
  Hits         4866     4866           
  Misses       1211     1211           
  Partials      306      306           

Flag	Coverage Δ
unittests	76.23% <ø> (ø)

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Impacted Files	Coverage Δ
mmgen/models/architectures/stylegan/mspie.py	91.58% <0.00%> (ø)

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