del iterator on_run_end()

[cowwoc]

What does this PR do?

Fixes #9390

Does your PR introduce any breaking changes? If yes, please list them.

No

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[codecov]

Codecov Report

Merging #9915 (257eb3a) into master (808edcd) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #9915   +/-   ##
======================================
- Coverage      89%     89%   -0%     
======================================
  Files         180     180           
  Lines       16147   16188   +41     
======================================
+ Hits        14318   14335   +17     
- Misses       1829    1853   +24     

[cowwoc]

Can someone please re-run the failing build? I don't have permission to.

[tchaton]

LGTM !

[carmocca]

I've changed back the test as we want to make sure we shutdown the workers.

[tchaton]

@carmocca Should we kill the workers only on the latest epoch ?

[cowwoc]

(Be sure to clean up even if training/inference is aborted due to an exception)