56 lines
2.1 KiB
Python
56 lines
2.1 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 torch
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from pytorch_lightning import Trainer
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from pytorch_lightning.strategies import SingleDeviceStrategy
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from tests.helpers.boring_model import BoringModel
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from tests.helpers.runif import RunIf
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def test_single_cpu():
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"""Tests if on_gpu and on_tpu is set correctly for single cpu plugin."""
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trainer = Trainer()
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assert isinstance(trainer.strategy, SingleDeviceStrategy)
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assert not trainer.strategy.on_gpu
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assert not trainer.strategy.on_tpu
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assert trainer.strategy.root_device == torch.device("cpu")
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class BoringModelGPU(BoringModel):
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def on_train_start(self) -> None:
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# make sure that the model is on GPU when training
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assert self.device == torch.device("cuda:0")
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self.start_cuda_memory = torch.cuda.memory_allocated()
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@RunIf(skip_windows=True, min_gpus=1)
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def test_single_gpu():
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"""Tests if device is set correctly when training and after teardown for single GPU plugin."""
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trainer = Trainer(gpus=1, fast_dev_run=True)
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# assert training type plugin attributes for device setting
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assert isinstance(trainer.strategy, SingleDeviceStrategy)
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assert trainer.strategy.on_gpu
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assert not trainer.strategy.on_tpu
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assert trainer.strategy.root_device == torch.device("cuda:0")
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model = BoringModelGPU()
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trainer.fit(model)
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# assert after training, model is moved to CPU and memory is deallocated
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assert model.device == torch.device("cpu")
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cuda_memory = torch.cuda.memory_allocated()
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assert cuda_memory < model.start_cuda_memory
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