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Source code for pytorch_lightning.accelerators.gpu

# Copyright The PyTorch Lightning team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
import os

import torch

import pytorch_lightning as pl
from pytorch_lightning.accelerators.accelerator import Accelerator
from pytorch_lightning.utilities.exceptions import MisconfigurationException

_log = logging.getLogger(__name__)


[docs]class GPUAccelerator(Accelerator): """Accelerator for GPU devices."""
[docs] def setup_environment(self) -> None: super().setup_environment() if "cuda" not in str(self.root_device): raise MisconfigurationException(f"Device should be GPU, got {self.root_device} instead") torch.cuda.set_device(self.root_device)
[docs] def setup(self, trainer: "pl.Trainer", model: "pl.LightningModule") -> None: """ Raises: MisconfigurationException: If the selected device is not GPU. """ self.set_nvidia_flags(trainer.local_rank) return super().setup(trainer, model)
[docs] def on_train_start(self) -> None: # clear cache before training torch.cuda.empty_cache()
@staticmethod def set_nvidia_flags(local_rank: int) -> None: # set the correct cuda visible devices (using pci order) os.environ["CUDA_DEVICE_ORDER"] = "PCI_BUS_ID" all_gpu_ids = ",".join([str(x) for x in range(torch.cuda.device_count())]) devices = os.getenv("CUDA_VISIBLE_DEVICES", all_gpu_ids) _log.info(f"LOCAL_RANK: {local_rank} - CUDA_VISIBLE_DEVICES: [{devices}]")
[docs] def teardown(self) -> None: super().teardown() self._move_optimizer_state(torch.device("cpu"))

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