[GitHub] szha opened a new pull request #10861: split trainer.step into allreduce and update

[GitBox <gi...@apache.org>]

szha opened a new pull request #10861: split trainer.step into allreduce and update
URL: https://github.com/apache/incubator-mxnet/pull/10861
 
 
   ## Description ##
   split trainer.step into allreduce and update
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - [x] All changes have test coverage:
   - Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
   - [x] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
   - [x] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   - [x] split trainer.step into allreduce and update
   - [x] add an option in trainer to force disable update_on_kvstore.

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