Added a param to stop training after finetunning

[jrzaurin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 94.81%. Comparing base (e48b2f9) to head (aad490f).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pytorch_widedeep/training/trainer_from_folder.py	40.00%	3 Missing ⚠️
pytorch_widedeep/training/trainer.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
- Coverage   94.85%   94.81%   -0.05%     
==========================================
  Files         126      126              
  Lines        8280     8288       +8     
==========================================
+ Hits         7854     7858       +4     
- Misses        426      430       +4     

Flag	Coverage Δ
unittests	94.81% <63.63%> (-0.05%)	⬇️

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