[Fix] Fix Coco-stuff164k on BiSeNetV1 config error

[MengzhangLI]

No description provided.

[codecov]

Codecov Report

Merging #1893 (0da053c) into master (13d4c39) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1893   +/-   ##
=======================================
  Coverage   89.04%   89.04%           
=======================================
  Files         144      144           
  Lines        8636     8636           
  Branches     1458     1458           
=======================================
  Hits         7690     7690           
  Misses        706      706           
  Partials      240      240           

Flag	Coverage Δ
unittests	89.04% <100.00%> (ø)

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Impacted Files	Coverage Δ
mmseg/version.py	58.33% <100.00%> (ø)

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[MeowZheng]

I have concerns about the results on coco-stuff https://github.com/open-mmlab/mmsegmentation/tree/master/configs/bisenetv1#coco-stuff-164k