32 lines
1.2 KiB
Python
32 lines
1.2 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 unittest import mock
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import pytest
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import torch
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from pytorch_lightning.utilities import device_parser
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@pytest.mark.skipif(
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"fork" in torch.multiprocessing.get_all_start_methods(), reason="Requires platform without forking support"
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)
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@mock.patch("torch.cuda.is_available", return_value=True)
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@mock.patch("torch.cuda.device_count", return_value=2)
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def test_num_cuda_devices_without_forking(*_):
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"""This merely tests that on platforms without fork support our helper functions fall back to the default
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implementation for determining cuda availability."""
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assert device_parser.is_cuda_available()
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assert device_parser.num_cuda_devices() == 2
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