[GitHub] taliesinb opened a new pull request #12064: Allow stop of arange to be inferred from dims.

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

taliesinb opened a new pull request #12064: Allow stop of arange to be inferred from dims.
URL: https://github.com/apache/incubator-mxnet/pull/12064
 
 
   ## Description ##
   
   This PR adds the ability for an arange operator to leave the stop value unspecified, so that it will be inferred from the output shape (via backward shape inference). This is important to achieve shape polymorphism for efficient bucketing. 
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [ ] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)
   - [X] Changes are complete (i.e. I finished coding on this PR)
   - [X] All changes have test coverage:
   - Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
   - Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
   - Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
   - [X] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - For new C++ functions in header files, their functionalities and arguments are documented. 
   - For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
   - Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$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] allow start and stop to be the same
   
   ## Comments ##
   - The more natural way of doing this would be for the stop parameter be None, but this was already used for a syntactic feature that allows arange(5) to be used to mean arange(0, 5). 

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