Fix the iter error when the number of GPUs is different during resume

[hhaAndroid]

reslove: open-mmlab/mmdetection#3676

[codecov]

Codecov Report

Merging #844 (3e9dfc2) into master (ca47ae1) will decrease coverage by 0.43%.
The diff coverage is 19.78%.

@@            Coverage Diff             @@
##           master     #844      +/-   ##
==========================================
- Coverage   62.97%   62.53%   -0.44%     
==========================================
  Files         145      145              
  Lines        8686     8772      +86     
  Branches     1571     1595      +24     
==========================================
+ Hits         5470     5486      +16     
- Misses       2951     3018      +67     
- Partials      265      268       +3     

Flag	Coverage Δ
unittests	62.53% <19.78%> (-0.44%)	⬇️

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Impacted Files	Coverage Δ
mmcv/runner/base_runner.py	67.82% <0.00%> (-1.82%)	⬇️
mmcv/runner/hooks/sampler_seed.py	50.00% <ø> (ø)
mmcv/tensorrt/tensorrt_utils.py	1.91% <3.22%> (+0.87%)	⬆️
mmcv/ops/nms.py	34.64% <50.00%> (+0.20%)	⬆️
mmcv/cnn/bricks/activation.py	87.50% <62.50%> (-12.50%)	⬇️
mmcv/utils/config.py	89.85% <81.81%> (-0.27%)	⬇️

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