Better decomp for torch.eye #163386

jansel · 2025-09-20T00:00:50Z

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pytorch-bot · 2025-09-20T00:00:53Z

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torch/_refs/__init__.py

[ghstack-poisoned]

vadimkantorov · 2025-09-20T00:54:50Z

btw does uint8/uint16 also work here? or no impls for unsigned?

jansel · 2025-09-20T04:00:45Z

Not sure if all backends implement those types.

Skylion007 · 2025-09-20T17:07:02Z

Not sure if all backends implement those types.

More reason to factor this out in their own utility. It would be good to have a robust check here we could grab the min dtype that is supported on target device.

Skylion007

This is subtly complicated to do, and we should factor it out into its own function.

torch/_refs/__init__.py

[ghstack-poisoned]

jansel · 2025-09-21T05:41:15Z

The dtype thing wasn't the main reason for this change, it matters close to zero for performance. Just an incidental change. (These will be registers in a memory-bound kernel.)

The real improvement here was removing the torch.where call from the common path which was causing issues for complex numbers.

[ghstack-poisoned]

eellison · 2025-09-22T12:50:06Z

torch/_refs/__init__.py


+def _strength_reduce_integer(val: int) -> torch.dtype:
+    for possible_dtype in (torch.uint8, torch.uint16, torch.int32):
+        if val <= torch.iinfo(possible_dtype).max:


nit: fix for unbacked. If adding guards here is intentional: guard_or_False. Otherwise: statically_known_true(val <= torch.iinfo(possible_dtype).max)

This is only called for int, for SymInt we use int64.

pytorchmergebot · 2025-09-22T16:11:47Z

Starting merge as part of PR stack under #163434

pytorchmergebot · 2025-09-22T21:46:47Z

Starting merge as part of PR stack under #163415

Fixes #163372 Pull Request resolved: #163415 Approved by: https://github.com/Skylion007 ghstack dependencies: #163386, #163398, #163387, #163414

Fixes #163082 Pull Request resolved: #163419 Approved by: https://github.com/Skylion007, https://github.com/mlazos ghstack dependencies: #163386, #163398, #163387, #163414, #163415

Fixes #163300 Pull Request resolved: #163434 Approved by: https://github.com/drisspg ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419

Fixes #163275 Pull Request resolved: #163393 Approved by: https://github.com/eellison, https://github.com/coconutruben ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434

Fixes #162624 Fixes #162586 Pull Request resolved: #163412 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393

Fixes #163257 Pull Request resolved: #163422 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412

Fixes #163420 Pull Request resolved: #163481 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422

Fixes #163449 Pull Request resolved: #163520 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481

Fixes #163457 Pull Request resolved: #163482 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481, #163520

This reverts commit a8cd437. See #163481 (comment) This PR might also cause issues with cudagraphs. Pull Request resolved: #163737 Approved by: https://github.com/ezyang ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481, #163520, #163482

Pull Request resolved: pytorch#163386 Approved by: https://github.com/eellison

Fixes pytorch#163328 Pull Request resolved: pytorch#163398 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386

Fixes pytorch#163243 Fixes pytorch#162561 Pull Request resolved: pytorch#163387 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398

Fixes pytorch#161484 Pull Request resolved: pytorch#163414 Approved by: https://github.com/Skylion007 ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387

…163415) Fixes pytorch#163372 Pull Request resolved: pytorch#163415 Approved by: https://github.com/Skylion007 ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414

Fixes pytorch#163082 Pull Request resolved: pytorch#163419 Approved by: https://github.com/Skylion007, https://github.com/mlazos ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415

Fixes pytorch#163300 Pull Request resolved: pytorch#163434 Approved by: https://github.com/drisspg ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419

Fixes pytorch#163275 Pull Request resolved: pytorch#163393 Approved by: https://github.com/eellison, https://github.com/coconutruben ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434

…63412) Fixes pytorch#162624 Fixes pytorch#162586 Pull Request resolved: pytorch#163412 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393

Fixes pytorch#163257 Pull Request resolved: pytorch#163422 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393, pytorch#163412

Fixes pytorch#163420 Pull Request resolved: pytorch#163481 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393, pytorch#163412, pytorch#163422

Fixes pytorch#163449 Pull Request resolved: pytorch#163520 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393, pytorch#163412, pytorch#163422, pytorch#163481

Fixes pytorch#163457 Pull Request resolved: pytorch#163482 Approved by: https://github.com/eellison ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393, pytorch#163412, pytorch#163422, pytorch#163481, pytorch#163520

This reverts commit a8cd437. See pytorch#163481 (comment) This PR might also cause issues with cudagraphs. Pull Request resolved: pytorch#163737 Approved by: https://github.com/ezyang ghstack dependencies: pytorch#163386, pytorch#163398, pytorch#163387, pytorch#163414, pytorch#163415, pytorch#163419, pytorch#163434, pytorch#163393, pytorch#163412, pytorch#163422, pytorch#163481, pytorch#163520, pytorch#163482

Fixes #163420 Pull Request resolved: #163481 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422

Fixes #163449 Pull Request resolved: #163520 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481

Fixes #163457 Pull Request resolved: #163482 Approved by: https://github.com/eellison ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481, #163520

This reverts commit a8cd437. See #163481 (comment) This PR might also cause issues with cudagraphs. Pull Request resolved: #163737 Approved by: https://github.com/ezyang ghstack dependencies: #163386, #163398, #163387, #163414, #163415, #163419, #163434, #163393, #163412, #163422, #163481, #163520, #163482

ghstack-source-id: 0e21cec Pull-Request: pytorch/pytorch#163386

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[dynamo] Fix issue with namedtuple slicing #163351

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[inductor] Fallback on strided complex add #163387

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Fix prims.broadcast_in_dim functionalization #163377

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[inductor] Support out_dtype arg to matmul #163393

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[inductor] Fix bug where viewed outputs get padded #163398

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[dynamo] Fix TorchFunctionMode handling with get_rng_state #163412

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[inductor] Skip test_baddmm on XPU #163414

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[inductor] Don't require_dense for grid_sampler_2d_backward #163415

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[inductor] libdevice.sqrt => tl.sqrt_rn #163419

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[inductor] Fix error from custom CUDA allocators #163422

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[inductor] Freeze layouts in FlexAttention #163434

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[inductor] Fix issue with scalar arg handling #163481

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[inductor] Fix divmod error in decomp #163482

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[inductor] Fix bugs in emulate_precision_casts #163520

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dsashidh pushed a commit to dsashidh/pytorch that referenced this pull request Sep 26, 2025

Better decomp for torch.eye (pytorch#163386)

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Pull Request resolved: pytorch#163386 Approved by: https://github.com/eellison

github-actions bot deleted the gh/jansel/534/head branch October 23, 2025 02:13

Khanaksahu pushed a commit to Khanaksahu/pytorch that referenced this pull request Nov 17, 2025

Better decomp for torch.eye

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ghstack-source-id: 0e21cec Pull-Request: pytorch/pytorch#163386

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/163386

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