junrushao1994 opened a new pull request #13283: [MXNET-1215] Allow dynamic shape exists in imperative mode URL: https://github.com/apache/incubator-mxnet/pull/13283 ## Description ## It is the PR I took over from @zheng-da at #12400 . All credits go to Da Zheng. This PR releases the constraint on NDArrays that shape used to be pre-determined. For unittesting, this PR introduces an operator called `BooleanMask` in contrib, which is a practical use case that actually produces dynamic shape. This is an initial step for the roadmap #12732. ## Checklist ## ### Essentials ### Please feel free to remove inapplicable items for your PR. - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes) - [ ] Changes are complete (i.e. I finished coding on this PR) - [ ] All changes have test coverage: - Unit tests are added for small changes to verify correctness (e.g. adding a new operator) - Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore) - Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL) - [x] Code is well-documented: - For user-facing API changes, API doc string has been updated. - For new C++ functions in header files, their functionalities and arguments are documented. - For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable - Check the API doc at http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$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] Introducing new methods in NDArray allowing delayed assignment of their shapes. - [x] Introducing boolean mask operator, which we believe will be useful in the future. - [ ] Add unit test. ## Comments ## No comments.
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