[Fix] Fix bug in non-distributed training/testing

[LeoXing1996]

Refers to open-mmlab/mmdetection#7019

[codecov]

Codecov Report

Merging #239 (8bd7e91) into master (40376b4) will decrease coverage by 0.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
- 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% <ø> (-0.53%)	⬇️

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

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