Fix multi-node distributed test

[ckkelvinchan]

As raised in #464.

[codecov]

Codecov Report

Merging #478 (fa62a45) into master (f9c9a95) will decrease coverage by 0.18%.
The diff coverage is 0.00%.

❗ Current head fa62a45 differs from pull request most recent head ddedf87. Consider uploading reports for the commit ddedf87 to get more accurate results

@@            Coverage Diff             @@
##           master     #478      +/-   ##
==========================================
- Coverage   80.56%   80.38%   -0.19%     
==========================================
  Files         190      190              
  Lines       10338    10262      -76     
  Branches     1533     1533              
==========================================
- Hits         8329     8249      -80     
- Misses       1780     1783       +3     
- Partials      229      230       +1     

Flag	Coverage Δ
unittests	80.36% <0.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmedit/apis/test.py	24.75% <0.00%> (-0.51%)	⬇️
...ackbones/encoder_decoders/pconv_encoder_decoder.py	43.47% <0.00%> (-2.36%)	⬇️
mmedit/models/base.py	82.75% <0.00%> (-2.09%)	⬇️
...ls/components/stylegan2/generator_discriminator.py	84.93% <0.00%> (-1.21%)	⬇️
...ones/encoder_decoders/two_stage_encoder_decoder.py	53.84% <0.00%> (-1.16%)	⬇️
...dels/backbones/encoder_decoders/encoders/resnet.py	66.01% <0.00%> (-0.97%)	⬇️
...s/backbones/encoder_decoders/gl_encoder_decoder.py	81.48% <0.00%> (-0.67%)	⬇️
mmedit/datasets/pipelines/normalization.py	88.88% <0.00%> (-0.59%)	⬇️
mmedit/models/mattors/indexnet.py	84.37% <0.00%> (-0.48%)	⬇️
mmedit/models/mattors/base_mattor.py	84.94% <0.00%> (-0.48%)	⬇️
... and 20 more

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