Split model Step function

[serathius]

/cc @joshjms @nwnt @fuweid @siyuanfoundation

[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.29%. Comparing base (f4ecf54) to head (87a2ed3).

Additional details and impacted files

see 21 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20195      +/-   ##
==========================================
- Coverage   69.31%   69.29%   -0.03%     
==========================================
  Files         413      413              
  Lines       34367    34367              
==========================================
- Hits        23821    23813       -8     
- Misses       9148     9166      +18     
+ Partials     1398     1388      -10     

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