[mxfp8 torch._scaled_grouped_mm] fix meta registration for 3d tensor #162765
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/162765
Note: Links to docs will display an error until the docs builds have been completed. ✅ No FailuresAs of commit 1f78541 with merge base 36338fc ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
ngimel
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Sep 11, 2025
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Meta registration checks for torch._scaled_grouped_mm has a bug for 3d "B" tensors. Namely, the scale shape for such a tensor should be 2d with shape (G, blocked_K * blocked_N), but it currently enforces an expected 3d shape of (G, blocked_K, blocked_N).
See Blas.cpp for correct validation logic here.