55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
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# 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 unittest.mock import Mock
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import pytest
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import torch
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from lightning_lite.strategies import SingleDeviceStrategy
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def test_single_device_default_device():
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assert SingleDeviceStrategy().root_device == torch.device("cpu")
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@pytest.mark.parametrize("device", ["cpu", torch.device("cpu"), "cuda:1", torch.device("cuda")])
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def test_single_device_root_device(device):
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assert SingleDeviceStrategy(device).root_device == torch.device(device)
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@pytest.mark.parametrize("device", [torch.device("cpu"), torch.device("cuda", 3)])
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def test_single_device_ranks(device):
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strategy = SingleDeviceStrategy(device)
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assert strategy.world_size == 1
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assert strategy.local_rank == 0
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assert strategy.global_rank == 0
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assert strategy.is_global_zero
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def test_single_device_collectives():
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"""Test that collectives in the single-device strategy act as the identity."""
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strategy = SingleDeviceStrategy()
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tensor = Mock()
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assert strategy.all_gather(tensor) == tensor
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assert strategy.reduce(tensor) == tensor
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assert strategy.broadcast(tensor) == tensor
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def test_single_device_module_to_device():
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strategy = SingleDeviceStrategy()
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strategy._root_device = Mock()
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module = Mock(spec=torch.nn.Module)
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strategy.module_to_device(module)
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module.to.assert_called_with(strategy.root_device)
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