[GitHub] junrushao1994 opened a new pull request #14018: [MXNET-1315] Add checks for dynamic-shaped operators in CachedOp

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junrushao1994 opened a new pull request #14018: [MXNET-1315] Add checks for dynamic-shaped operators in CachedOp
URL: https://github.com/apache/incubator-mxnet/pull/14018
 
 
   ## Description ##
   This PR is part of the effort that enables dynamic while loop. #13419 
   
   CC: @szha @zheng-da 
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - [x] All changes have test coverage:
   - Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
   - Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
   - Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
   - [x] Code is well-documented: 
   - For user-facing API changes, API doc string has been updated. 
   - For new C++ functions in header files, their functionalities and arguments are documented. 
   - For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
   - Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$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] Added the field `is_dynamic` in `CachedOp` for upstream control flow operators to create a dynamic operators.
   - [x] Allow infer shape to determine whether a graph contains unknown nodes.
   
   ## Comments ##
   - If this change is a backward incompatible change, why must this change be made.
   - Interesting edge cases to note here
   

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