70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
# Copyright The PyTorch Lightning team.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Any, Dict, List, Union
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import torch
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from pytorch_lightning.accelerators.accelerator import Accelerator
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from pytorch_lightning.utilities.exceptions import MisconfigurationException
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from pytorch_lightning.utilities.rank_zero import rank_zero_warn
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from pytorch_lightning.utilities.types import _DEVICE
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class CPUAccelerator(Accelerator):
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"""Accelerator for CPU devices."""
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def setup_environment(self, root_device: torch.device) -> None:
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"""
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Raises:
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MisconfigurationException:
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If the selected device is not CPU.
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"""
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super().setup_environment(root_device)
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if root_device.type != "cpu":
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raise MisconfigurationException(f"Device should be CPU, got {root_device} instead.")
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def get_device_stats(self, device: _DEVICE) -> Dict[str, Any]:
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"""CPU device stats aren't supported yet."""
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return {}
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@staticmethod
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def parse_devices(devices: Union[int, str, List[int]]) -> Union[int, str, List[int]]:
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"""Accelerator device parsing logic."""
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return devices
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@staticmethod
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def get_parallel_devices(devices: Union[int, str, List[int]]) -> List[torch.device]:
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"""Gets parallel devices for the Accelerator."""
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if isinstance(devices, int):
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return [torch.device("cpu")] * devices
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rank_zero_warn(
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f"The flag `devices` must be an int with `accelerator='cpu'`, got `devices={devices!r}` instead."
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)
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return []
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@staticmethod
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def auto_device_count() -> int:
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"""Get the devices when set to auto."""
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return 1
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@staticmethod
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def is_available() -> bool:
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"""CPU is always available for execution."""
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return True
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@staticmethod
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def name() -> str:
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"""Name of the Accelerator."""
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return "cpu"
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