ptrendx opened a new pull request #15657: Eliminate common expressions URL: https://github.com/apache/incubator-mxnet/pull/15657 ## Description ## This PR introduces a graph pass that eliminates redundant common expressions in the graph. For example, let's look at the graph created from a following Python code: ``` a = mx.sym.Variable() out = (a + 5) * (a + 5) ``` This graph will compute `a+5` twice, which is wasteful. After the pass introduced in this PR, the actual executed graph will be equivalent to ``` a = mx.sym.Variable() b = a + 5 out = b * b ``` which computes the `a+5` only once. @eric-haibin-lin FYI ## Checklist ## ### Essentials ### Please feel free to remove inapplicable items for your PR. - [x] 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) - [x] Code is well-documented: - For new C++ functions in header files, their functionalities and arguments are documented. - [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 ### - [ ] Feature1, tests, (and when applicable, API doc) - [ ] Feature2, tests, (and when applicable, API doc) ## Comments ##
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