Support option --trained

[xadupre]

fixed #62

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.74%. Comparing base (a5759f0) to head (1ef2a02).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   70.74%   70.74%   -0.01%     
==========================================
  Files          76       76              
  Lines        6594     6593       -1     
==========================================
- Hits         4665     4664       -1     
  Misses       1929     1929              

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