[Fix] Fix split in Darts config

[gaoyang07]

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[codecov]

Codecov Report

Base: 66.42% // Head: 66.45% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (6d8b0ef) compared to base (a0aff4d).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #451      +/-   ##
==========================================
+ Coverage   66.42%   66.45%   +0.02%     
==========================================
  Files          93       93              
  Lines        3467     3467              
  Branches      625      625              
==========================================
+ Hits         2303     2304       +1     
  Misses       1058     1058              
+ Partials      106      105       -1     

Flag	Coverage Δ
unittests	66.42% <0.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
mmrazor/apis/mmcls/train.py	26.50% <0.00%> (ø)
mmrazor/utils/misc.py	100.00% <0.00%> (+4.76%)	⬆️

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[gaoyang07]

Now DARTS in master is fine.