You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1.6 KiB
39 lines
1.6 KiB
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)
|