Update train.py

[beet-aizu]

Fix the help message of the argument "workers"

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[codecov]

Codecov Report

Merging #3409 (9886501) into master (0043e5f) will increase coverage by 17.95%.
The diff coverage is n/a.

❗ Current head 9886501 differs from pull request most recent head 6478dd9. Consider uploading reports for the commit 6478dd9 to get more accurate results

@@             Coverage Diff             @@
##           master    #3409       +/-   ##
===========================================
+ Coverage   56.87%   74.83%   +17.95%     
===========================================
  Files          43      105       +62     
  Lines        3562     9722     +6160     
  Branches      546     1563     +1017     
===========================================
+ Hits         2026     7275     +5249     
- Misses       1416     1960      +544     
- Partials      120      487      +367     

Impacted Files	Coverage Δ
torchvision/utils.py	59.57% <0.00%> (-1.97%)	⬇️
torchvision/models/densenet.py	83.58% <0.00%> (-1.65%)	⬇️
torchvision/ops/__init__.py	100.00% <0.00%> (ø)
torchvision/models/__init__.py	100.00% <0.00%> (ø)
torchvision/datasets/__init__.py	100.00% <0.00%> (ø)
torchvision/transforms/__init__.py	100.00% <0.00%> (ø)
torchvision/models/quantization/mobilenetv2.py	87.75% <0.00%> (ø)
torchvision/models/mnasnet.py	75.75% <0.00%> (ø)
torchvision/datasets/samplers/__init__.py	100.00% <0.00%> (ø)
torchvision/ops/poolers.py	86.53% <0.00%> (ø)
... and 94 more

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[NicolasHug]

Good catch! thanks @beet-aizu

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