[Relax][ONNX] Drop NaN-preservation isnan-where wrappers#19847
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…ndefined) Remove the explicit NaN-preservation guards added in the ONNX frontend for Relu (apache#19750), Sign (apache#19674), Clip's input (apache#19535), and ReduceMax/ReduceMin (the _reduce_min_max_preserve_nan helper, apache#19750). Each paid an extra isnan + where -- the reduce helper a full sum(isnan) pass -- over the data solely to force a NaN input through, a corner case that mostly shows up in fuzzing. NaN handling for these ops is now left unspecified, matching the less-strict but efficient direction: relu/sign reduce to the plain relax op and ReduceMax/ReduceMin to relax.op.max/min. Clip keeps the cheap scalar NaN-bound sanitization: a NaN min/max bound is still treated as unbounded (ORT parity), which is a distinct concern from per-element input-NaN passthrough. Drop the corresponding tests: test_relu_nan_preserve, test_sign_nan_preserve, test_reduce_min_max_nan_preserve, and the NaN-input case of test_clip_v13.
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This pull request removes custom NaN-preserving logic and its associated helper function _reduce_min_max_preserve_nan from several ONNX operators in the Relax frontend, including Clip, Relu, ReduceMax, ReduceMin, and Sign. Consequently, the corresponding unit tests verifying NaN preservation behavior for these operators have also been removed. I have no feedback to provide.
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tqchen
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Jun 19, 2026
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Thanks @tlopex! |
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This pr removes the explicit NaN-preservation guards added in the ONNX frontend for Relu (#19750), Sign (#19674), Clip's input (#19535), and ReduceMax/ReduceMin (the _reduce_min_max_preserve_nan helper, #19750). Each paid an extra isnan + where -- the reduce helper a full sum(isnan) pass
This pr also drops the corresponding tests: test_relu_nan_preserve, test_sign_nan_preserve, test_reduce_min_max_nan_preserve, and the NaN-input case of test_clip_v13.
PRs about NaN-preservation updated in backend will be followed up in the future