gemini-code-assist[bot] commented on PR #18515: URL: https://github.com/apache/tvm/pull/18515#issuecomment-3583917852
## Summary of Changes Hello @kimm240, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request significantly enhances the `FuseReductionEpilogue` primitive by introducing support for `Clipping` operations. Previously limited to `Bias` and `BiasReLU`, this change expands the optimization's applicability to common deep learning patterns involving value clamping. A key aspect of this update is the adoption of per-iteration semantics for non-linear epilogues, which is a deliberate design choice with documented implications for numerical results. The implementation includes robust pattern matching for commutative variants and comprehensive testing to ensure correctness and stability. ### Highlights * **Clipping Pattern Support**: The `FuseReductionEpilogue` primitive now supports `Clipping` patterns, specifically `min(max(x, lower), upper)` and its commutative variants, allowing for fusion of clipping operations into reduction blocks. * **Per-Iteration Semantics for Non-Linear Epilogues**: For non-linear epilogues like `BiasReLU` and the newly added `Clipping`, the fusion changes the computation semantics from post-reduction application to per-iteration application. This is explicitly documented and verified by tests, acknowledging potential numerical differences. * **Enhanced Pattern Matching**: The `AnalyzeEpiloguePattern` function has been extended to detect all commutative variants of `min/max` for clipping and to handle `max(0, x)` forms for `BiasReLU`, improving robustness. * **Updated Reduction Block Creation**: The `CreateFusedReductionBlock` and `BufferReplacer` logic have been updated to correctly apply the `BiasReLU` and `Clipping` operations to the initial value and per-iteration updates within the fused reduction block. * **Comprehensive Test Coverage**: New test cases have been added to validate the `Clipping` pattern fusion, including basic fusion, numerical correctness (matching per-iteration reference), handling of multiple epilogue blocks, and recognition of various commutative forms. <details> <summary><b>Using Gemini Code Assist</b></summary> <br> The full guide for Gemini Code Assist can be found on our [documentation page](https://developers.google.com/gemini-code-assist/docs/review-github-code), here are some quick tips. <b>Invoking Gemini</b> You can request assistance from Gemini at any point by creating a comment using either `/gemini <command>` or `@gemini-code-assist <command>`. 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