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from typing import Any |
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import torch |
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from torch._utils import _get_device_index as _torch_get_device_index |
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def _get_device_index( |
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device: Any, optional: bool = False, allow_cpu: bool = False |
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) -> int: |
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r"""Get the device index from :attr:`device`, which can be a torch.device object, a Python integer, or ``None``. |
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If :attr:`device` is a torch.device object, returns the device index if it |
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is a MTIA device. Note that for a MTIA device without a specified index, |
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i.e., ``torch.device('mtia')``, this will return the current default MTIA |
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device if :attr:`optional` is ``True``. If :attr:`allow_cpu` is ``True``, |
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CPU devices will be accepted and ``-1`` will be returned in this case. |
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If :attr:`device` is a Python integer, it is returned as is. |
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If :attr:`device` is ``None``, this will return the current default MTIA |
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device if :attr:`optional` is ``True``. |
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""" |
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if isinstance(device, int): |
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return device |
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if isinstance(device, str): |
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device = torch.device(device) |
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if isinstance(device, torch.device): |
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if allow_cpu: |
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if device.type not in ["mtia", "cpu"]: |
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raise ValueError(f"Expected a mtia or cpu device, but got: {device}") |
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elif device.type != "mtia": |
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raise ValueError(f"Expected a mtia device, but got: {device}") |
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if not torch.jit.is_scripting(): |
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if isinstance(device, torch.mtia.device): |
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return device.idx |
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return _torch_get_device_index(device, optional, allow_cpu) |
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