The val function code in the workflow process does not work properly, and the code parameters do not match

[liujianghao]

Def val_step(self, data_batch, **kwargs) in base.py has no optimizer，
However,the outputs = self.model. val_step(data_batch, self. optimizer, **kwargs) in epoch_based_runner.py contains the parameter "optimizer".

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[codecov]

Codecov Report

Merging #905 (e30d72e) into master (186a1fc) will not change coverage.
The diff coverage is 100.00%.

❗ Current head e30d72e differs from pull request most recent head 15071c0. Consider uploading reports for the commit 15071c0 to get more accurate results

@@           Coverage Diff           @@
##           master     #905   +/-   ##
=======================================
  Coverage   89.09%   89.09%           
=======================================
  Files         112      112           
  Lines        6081     6081           
  Branches      977      977           
=======================================
  Hits         5418     5418           
  Misses        468      468           
  Partials      195      195           

Flag	Coverage Δ
unittests	89.09% <100.00%> (ø)

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Impacted Files	Coverage Δ
mmseg/models/segmentors/base.py	44.11% <100.00%> (ø)

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[Junjun2016]

Hi @liujianghao
Thanks for your contribution!
Please fix the lint error and use English.

[Junjun2016]

Hi @liujianghao
Thanks for your contribution.
The bug has been fixed in #906.

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