40 lines
1.6 KiB
Python
40 lines
1.6 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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import pytorch_lightning as pl
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from pytorch_lightning.accelerators.accelerator import Accelerator
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from pytorch_lightning.plugins.precision import MixedPrecisionPlugin
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from pytorch_lightning.utilities.exceptions import MisconfigurationException
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class CPUAccelerator(Accelerator):
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""" Accelerator for CPU devices. """
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def setup(self, trainer: 'pl.Trainer', model: 'pl.LightningModule') -> None:
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"""
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Raises:
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MisconfigurationException:
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If AMP is used with CPU, or if the selected device is not CPU.
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"""
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if isinstance(self.precision_plugin, MixedPrecisionPlugin):
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raise MisconfigurationException(
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" Mixed precision is currenty only supported with the AMP backend"
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" and AMP + CPU is not supported. Please use a GPU option or"
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" change precision setting."
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)
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if "cpu" not in str(self.root_device):
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raise MisconfigurationException(f"Device should be CPU, got {self.root_device} instead.")
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return super().setup(trainer, model)
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