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