Loop Refactor 2/N - Remove Old Training Loop

[awaelchli]

What does this PR do?

Follow up to #7871

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[codecov]

Codecov Report

Merging #7985 (f36ed43) into master (971908a) will decrease coverage by 5%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #7985    +/-   ##
=======================================
- Coverage      92%     87%    -5%     
=======================================
  Files         207     207            
  Lines       13363   13363            
=======================================
- Hits        12233   11598   -635     
- Misses       1130    1765   +635     

[pep8speaks]

Hello @awaelchli! Thanks for updating this PR.

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-06-15 13:27:52 UTC

[Borda]

if it does not break anything it is safe :D

[tchaton]

LGTM !