Fix unsafe_chunk decomposition for empty tensors by parsshar-RH · Pull Request #170053 · pytorch/pytorch

parsshar-RH · 2025-12-10T07:09:13Z

Summary:

Fix torch.unsafe_chunk with empty size input tensor.
Matches eager mode behavior

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @kadeng @muchulee8 @amjames @chauhang @aakhundov @coconutruben @jataylo

pytorch-bot · 2025-12-10T07:09:17Z

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parsshar-RH · 2025-12-10T07:10:44Z

@pytorchbot label "topic: not user facing"

parsshar-RH · 2025-12-11T04:10:20Z

Hi @cyyever

Please review the PR
Thanks!

cyyever · 2025-12-11T04:27:18Z

test/inductor/test_torchinductor_codegen_dynamic_shapes.py

    "test_empty2_dynamic_shapes": TestFailure(("cpu", "cuda", "xpu")),
    "test_empty_strided_dynamic_shapes": TestFailure(("cpu", "cuda", "xpu")),
+    "test_unsafe_chunk_empty_tensor_dynamic_shapes": TestFailure(
+        ("cpu", "cuda", "xpu"), is_skip=True


Why skip this test?

@cyyever
Looks like while chunking the empty tensor, same empty tensor is returned multiple times. Hence no dynamic shape code.

Generated code:

def call(self, args): arg0_1, arg1_1 = args args.clear() s64 = arg1_1 return (arg0_1, arg0_1, arg0_1, arg0_1, )

cyyever · 2025-12-11T04:27:31Z

test/inductor/test_torchinductor.py

+
+        self.common(fn, (torch.zeros(0), 2))
+
+        self.common(fn, (torch.zeros(0, dtype=torch.float32), 3))


No assertion in this test.

Added assertions in test.
Please let me know if more changes are needed

Thanks for the review

cyyever · 2025-12-12T03:09:58Z

@pytorchbot merge -i

pytorchmergebot · 2025-12-12T03:11:55Z

Merge started

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pytorchmergebot · 2025-12-12T04:15:26Z

Merge failed

Reason: 1 jobs have failed, first few of them are: trunk / linux-jammy-rocm-py3.10 / test (default, 3, 6, linux.rocm.gpu.gfx942.1)

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Raised by workflow job

parsshar-RH · 2025-12-12T18:09:48Z

Hi @cyyever

Looks like some unrelated CI checks are failing.
Please review and merge.

Thanks!

jansel · 2025-12-12T18:30:02Z

@pytorchbot merge -i

pytorchmergebot · 2025-12-12T18:32:09Z

Merge started

Your change will be merged while ignoring the following 3 checks: trunk / linux-jammy-rocm-py3.10 / test (default, 3, 6, linux.rocm.gpu.gfx942.1), trunk / linux-jammy-rocm-py3.10 / test (default, 5, 6, linux.rocm.gpu.gfx942.1), trunk / linux-jammy-rocm-py3.10 / test (default, 6, 6, linux.rocm.gpu.gfx942.1)

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pytorchmergebot · 2025-12-12T18:43:23Z

Merge failed

Reason: 1 jobs have failed, first few of them are: inductor / unit-test / inductor-pallas-cpu-test / test (inductor-pallas-cpu, 1, 1, linux.12xlarge)

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Raised by workflow job

cyyever · 2025-12-12T23:48:25Z

@pytorchbot merge -f "Unrelated failures"

pytorchmergebot · 2025-12-12T23:50:01Z

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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cyyever · 2025-12-13T23:55:23Z

@parsshar-RH Could you rebase to main and check CI tests? You need to revert the reverting commit hash.

parsshar-RH · 2025-12-15T05:34:46Z

@pytorchbot rebase -b main

pytorchmergebot · 2025-12-15T05:36:22Z

@pytorchbot started a rebase job onto refs/remotes/origin/main. Check the current status here

pytorchmergebot · 2025-12-15T05:36:26Z

Successfully rebased fix-unsafe-chunk onto refs/remotes/origin/main, please pull locally before adding more changes (for example, via git checkout fix-unsafe-chunk && git pull --rebase)

parsshar-RH · 2025-12-15T10:37:35Z

Hi @cyyever @jansel
CI checks are working now

parsshar-RH · 2025-12-16T03:17:50Z

Hi @jansel

Please review and merge the PR
Thanks

Fixes pytorch#147277 Summary: - Fix `torch.unsafe_chunk` with empty size input tensor. - Matches eager mode behavior Pull Request resolved: pytorch#170053 Approved by: https://github.com/cyyever, https://github.com/jansel

)" This reverts commit d6604b8. Reverted pytorch#170053 on behalf of https://github.com/pytorch-auto-revert due to Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable ([comment](pytorch#170053 (comment)))

parsshar-RH · 2025-12-17T08:45:18Z

@pytorchbot merge

pytorchmergebot · 2025-12-17T08:47:18Z

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Reverted pytorch/pytorch#169735 on behalf of https://github.com/jeffdaily due to causing failure... -------------------------------------------------------------------------------- Reverted GitHub Commit: 6a39d67f06e21bde67b99d552eaa3113b5d02a36 Commit Hash: 7eff3fac7860322a4039c13ea333a5de66f4ae78 Author: PyTorch MergeBot <[email protected]> Date: 2025-12-11 20:40:06 Title: Revert "[FX] Fix node normalization w.r.t. keyword "from" which breaks FX codegen (#169328)" 🟢 STATUS: The reverted commit does not appear to be in release/2.10, so this revert may not be needed. Body Preview: This reverts commit 6a39d67f06e21bde67b99d552eaa3113b5d02a36. 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Reverted pytorch/pytorch#169577 on behalf of https://github.com/izaitsevfb due to my bad, this i... -------------------------------------------------------------------------------- Reverted GitHub Commit: eabb7ad2128580ef674446027b95bcf4e21e8df3 🏷️ Tags matching v[0-9]+.[0-9]+.[0-9]+-rc[0-9]+ for commit eabb7ad2128580ef674446027b95bcf4e21e8df3: - v2.10.0-rc1 Commit Hash: 8b21f924c3c24d4cbe239265c87aeb7b271fe974 Author: PyTorch MergeBot <[email protected]> Date: 2025-12-11 16:13:49 Title: Revert "[Inductor XPU GEMM] Step 1/N: Refactor cutlass configuration. (#160174)" 🔴 WARNING: This is possibly a revert of a commit that was included in a release candidate. The reverted commit may be present in release/2.10. Body Preview: This reverts commit eabb7ad2128580ef674446027b95bcf4e21e8df3. Reverted pytorch/pytorch#160174 on behalf of https://github.com/huydhn due to Sorry for revertin... -------------------------------------------------------------------------------- Reverted GitHub Commit: 015826fc5a6022b579a2b692559597e4565e7c00 Commit Hash: bbef332f298b59a71e21e573a4d9f58073b34e20 Author: PyTorch MergeBot <[email protected]> Date: 2025-12-11 16:07:26 Title: Revert "Differentiability Support for Functional Collectives (#168140)" 🟢 STATUS: The reverted commit does not appear to be in release/2.10, so this revert may not be needed. Body Preview: This reverts commit 015826fc5a6022b579a2b692559597e4565e7c00. 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Reverted pytorch/pytorch#170066 on behalf of https://github.com/ezyang due to reenabled test is ... -------------------------------------------------------------------------------- Reverted GitHub Commit: 033659b2fb727f84f425f56550e5e2cb2d5db9f9 Commit Hash: fc85d4bd2f305b6871673194192602c620472b7f Author: PyTorch MergeBot <[email protected]> Date: 2025-12-11 12:24:01 Title: Revert "[c10d][Sym mem] Make nccl backend full fledged with nccl 2.28.9-1 (#168129)" 🟢 STATUS: The reverted commit does not appear to be in release/2.10, so this revert may not be needed. Body Preview: This reverts commit 033659b2fb727f84f425f56550e5e2cb2d5db9f9. 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Reverted pytorch/pytorch#168129 on behalf of https://github.com/pytorch-auto-revert due to Rever... -------------------------------------------------------------------------------- Reverted GitHub Commit: 4aada15a726fd190ea950cb7eed76ec649d3d6d8 Commit Hash: 340b2abc8562e28382469f25f7994a235d3ca0d2 Author: PyTorch MergeBot <[email protected]> Date: 2025-12-10 22:22:18 Title: Revert "[FX] Fix node normalization w.r.t. keyword "from" which breaks FX codegen (#169328)" 🟢 STATUS: The reverted commit does not appear to be in release/2.10, so this revert may not be needed. Body Preview: This reverts commit 4aada15a726fd190ea950cb7eed76ec649d3d6d8. 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Fixes pytorch#147277 Summary: - Fix `torch.unsafe_chunk` with empty size input tensor. - Matches eager mode behavior Pull Request resolved: pytorch#170053 Approved by: https://github.com/cyyever, https://github.com/jansel

)" This reverts commit d6604b8. Reverted pytorch#170053 on behalf of https://github.com/pytorch-auto-revert due to Reverted automatically by pytorch's autorevert, to avoid this behaviour add the tag autorevert: disable ([comment](pytorch#170053 (comment)))

Fixes pytorch#147277 Summary: - Fix `torch.unsafe_chunk` with empty size input tensor. - Matches eager mode behavior Pull Request resolved: pytorch#170053 Approved by: https://github.com/cyyever, https://github.com/jansel

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parsshar-RH added 4 commits December 15, 2025 05:36

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		self.common(fn, (torch.zeros(0), 2))

		self.common(fn, (torch.zeros(0, dtype=torch.float32), 3))

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