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CUDAAccelerator.setup_device: fix unrelated device init by matmul precision check #21726

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CUDAAccelerator.setup_device: fix unrelated device init by matmul precision check #21726

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c2f367c
CUDAAccelerator.setup_device: fix unrelated device init by matmul pre…
bm371613 May 19, 2026
239e437
Merge branch 'master' into prevent-cuda-init-bad-device-by-check-matm…
justusschock Jun 1, 2026
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2 changes: 1 addition & 1 deletion src/lightning/fabric/accelerators/cuda.py
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Original file line number Diff line number Diff line change
Expand Up @@ -34,8 +34,8 @@ def setup_device(self, device: torch.device) -> None:
"""
if device.type != "cuda":
raise ValueError(f"Device should be CUDA, got {device} instead.")
_check_cuda_matmul_precision(device)
torch.cuda.set_device(device)
_check_cuda_matmul_precision(device) # may initialize CUDA, set_device first

@override
def teardown(self) -> None:
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2 changes: 1 addition & 1 deletion src/lightning/pytorch/accelerators/cuda.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,8 +43,8 @@ def setup_device(self, device: torch.device) -> None:
"""
if device.type != "cuda":
raise MisconfigurationException(f"Device should be GPU, got {device} instead")
_check_cuda_matmul_precision(device)
torch.cuda.set_device(device)
_check_cuda_matmul_precision(device) # may initialize CUDA, set_device first

@override
def setup(self, trainer: "pl.Trainer") -> None:
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