Extend torch function support to ALL arguments, not just scalar type (but not insides of list) #145089

ezyang · 2025-01-17T17:28:38Z

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-> Extend torch function support to ALL arguments, not just scalar type (but not insides of list) #145089

Signed-off-by: Edward Z. Yang ezyang@meta.com

cc @albanD

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pytorch-bot · 2025-01-17T17:28:43Z

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pull / linux-jammy-py3_9-clang9-xla / test (xla, 1, 1, linux.12xlarge, unstable) (gh) (#158876)
/var/lib/jenkins/workspace/xla/torch_xla/csrc/runtime/BUILD:476:14: Compiling torch_xla/csrc/runtime/xla_util_test.cpp failed: (Exit 1): gcc failed: error executing CppCompile command (from target //torch_xla/csrc/runtime:xla_util_test) /usr/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer -g0 -O2 '-D_FORTIFY_SOURCE=1' -DNDEBUG -ffunction-sections ... (remaining 229 arguments skipped)

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: 389c821 Pull Request resolved: #145089

ezyang · 2025-01-24T15:54:31Z

The specific problem relates to torch function redispatch. Consider the argument overload list for Tensor.set_:

  static PythonArgParser parser(
      {
          "set_()",
          "set_(Storage source)",
          "set_(Storage source, SymInt storage_offset, SymIntArrayRef size, SymIntArrayRef stride=None)",
          "set_(Tensor source)",
          "set_(Tensor source, SymInt storage_offset, SymIntArrayRef size, SymIntArrayRef stride=None)",
      },
      /*traceable=*/false);

This says we attempt to resolve the Storage overload before the Tensor overload. When a Tensor has a __torch_function__ on it, the current implementation of the patch causes it to match the Storage (because an object with torch function always matches). Now the problem is when we redispatch with torch function disabled, it STILL matches and we end up attempting the Storage overload.

So maybe we need some special case saying that if something is a Tensor, it doesn't match for non-Tensor arguments? Hmm...

[ghstack-poisoned]

… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: dcef210 Pull Request resolved: #145089

ezyang · 2025-01-25T03:49:34Z

@vmoens @albanD I don't really know if I want to land this before I go on leave, it might have unintended side effects. Also, it doesn't work with entries in lists, which probably should be done before this is considered feature complete.

vmoens · 2025-01-25T18:22:11Z

Sure I'm in no hurry for this to land, we can talk about the implications once you're back!

ezyang · 2025-08-07T14:45:32Z

We ballin' this

[ghstack-poisoned]

… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: de8ef4a Pull Request resolved: #145089

albanD

yolo I guess? Not sure if we want more extensive testing for this..

albanD · 2025-08-07T15:58:28Z

torch/csrc/utils/python_arg_parser.cpp

+  // that internally
+  if (check_has_torch_function(obj, /*ignore_mode*/ true) &&
+      !THPVariable_Check(obj)) {
+    // tensor subclasses and unrelated objects with __torch_function__


This needs updating as only non-subclass are caught here actually.

[ghstack-poisoned]

ezyang · 2025-08-07T20:20:52Z

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: 3046eb6 Pull Request resolved: #145089

pytorchmergebot · 2025-08-07T20:23:29Z

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…(but not insides of list) (pytorch#145089) Signed-off-by: Edward Z. Yang <ezyang@meta.com> Pull Request resolved: pytorch#145089 Approved by: https://github.com/albanD, https://github.com/zou3519

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ezyang mentioned this pull request Jan 17, 2025

Add support for torch function on dtype arguments #145085

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[POC] Extend torch function support to ALL arguments, not just scalar…

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: 389c821 Pull Request resolved: #145089

github-actions bot requested review from SherlockNoMad, albanD, antoniojkim, bdhirsh and miladm January 17, 2025 17:28

ezyang requested a review from vmoens January 21, 2025 14:36

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[POC] Extend torch function support to ALL arguments, not just scalar…

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: dcef210 Pull Request resolved: #145089

ezyang changed the title ~~[POC] Extend torch function support to ALL arguments, not just scalar type (but not insides of list)~~ Extend torch function support to ALL arguments, not just scalar type (but not insides of list) Jan 25, 2025

ezyang changed the title ~~Extend torch function support to ALL arguments, not just scalar type (but not insides of list)~~ [POC] Extend torch function support to ALL arguments, not just scalar type (but not insides of list) Jan 25, 2025

ezyang added the no-stale label Jan 25, 2025

ezyang changed the title ~~[POC] Extend torch function support to ALL arguments, not just scalar type (but not insides of list)~~ Extend torch function support to ALL arguments, not just scalar type (but not insides of list) Aug 7, 2025

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[POC] Extend torch function support to ALL arguments, not just scalar…

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: de8ef4a Pull Request resolved: #145089

ezyang added topic: new features topic category module: python frontend For issues relating to PyTorch's Python frontend and removed no-stale labels Aug 7, 2025

ezyang requested review from zou3519 and removed request for vmoens August 7, 2025 14:55

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Delete Python reference implementation from torchdim, as it is untested #160115

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[POC] Extend torch function support to ALL arguments, not just scalar…

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… type (but not insides of list) Signed-off-by: Edward Z. Yang <ezyang@meta.com> ghstack-source-id: 3046eb6 Pull Request resolved: #145089

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torch_function objects passed as non-Tensor args should trigger overrides #119194

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