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Add is_cpu op #2758

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Merged
merged 4 commits into from
Nov 21, 2025
Merged

Add is_cpu op #2758

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32777f4
Add Tensor.is_cpu
kiya00 Nov 19, 2025
743d803
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Nov 19, 2025
dc081c6
fix review comment
kiya00 Nov 20, 2025
035cfe8
Merge branch 'main' into is_cpu
shino16 Nov 20, 2025
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14 changes: 14 additions & 0 deletions thunder/tests/opinfos.py
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Original file line number Diff line number Diff line change
Expand Up @@ -555,6 +555,20 @@ def _is_cuda_torch(x: torch.Tensor) -> bool:
tensor_properties.append(is_cuda_opinfo)


def _is_cpu_torch(x: torch.Tensor) -> bool:
return x.is_cpu


is_cpu_opinfo = OpInfo(
ltorch.is_cpu,
sample_input_generator=elementwise_unary_generator,
torch_reference=_is_cpu_torch,
dtypes=(datatypes.all_dtypes),
)

tensor_properties.append(is_cpu_opinfo)


def _is_nested_torch(x: torch.Tensor) -> bool:
return x.is_nested

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8 changes: 8 additions & 0 deletions thunder/torch/__init__.py
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Expand Up @@ -333,6 +333,14 @@ def is_cuda(a: TensorLike, /) -> bool:
return a.device.devicetype is devices.DeviceType.CUDA


@torchsymbol(torch.Tensor.is_cpu, is_property=True, id="torch.Tensor.is_cpu")
def is_cpu(a: TensorLike, /) -> bool:
return a.device.devicetype is devices.DeviceType.CPU


register_method("is_cpu", is_cpu)


@torchsymbol(torch.polar, id="torch.polar")
def polar(abs_: TensorLike, angle: TensorLike):
# Decompose polar into real/imag using Thunder ops and construct complex via mapped torch.complex
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