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tests: Gracefully handle missing set_device for mps #4028

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tests: Gracefully handle missing set_device for mps #4028

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4 changes: 3 additions & 1 deletion tests/test_accelerator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -259,7 +259,9 @@ def noop(*args, **kwargs):
pass

with (
patch(f"torch.{torch_device}.set_device", noop),
# Some backends such as MPS do not expose a module-level `set_device`.
# This test only exercises env var parsing, so a synthetic attribute is enough.
patch(f"torch.{torch_device}.set_device", noop, create=True),
patch_environment(ACCELERATE_TORCH_DEVICE=f"{torch_device}:64"),
):
accelerator = Accelerator()
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