64 lines
2.0 KiB
Python
64 lines
2.0 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 subprocess
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import sys
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from textwrap import dedent
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from tests_fabric.helpers.runif import RunIf
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from lightning_fabric.strategies.deepspeed import _DEEPSPEED_AVAILABLE
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def test_imports():
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try:
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import deepspeed # noqa
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except ModuleNotFoundError:
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assert not _DEEPSPEED_AVAILABLE
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else:
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assert _DEEPSPEED_AVAILABLE
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def test_import_fabric_with_torch_dist_unavailable():
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"""Test that the package can be imported regardless of whether torch.distributed is available."""
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code = dedent(
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"""
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import torch
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torch.distributed.is_available = lambda: False # pretend torch.distributed not available
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import lightning_fabric
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"""
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)
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# run in complete isolation
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assert subprocess.call([sys.executable, "-c", code]) == 0
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@RunIf(deepspeed=True)
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def test_import_deepspeed_lazily():
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"""Test that we are importing deepspeed only when necessary."""
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code = dedent(
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"""
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import lightning_fabric
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import sys
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assert 'deepspeed' not in sys.modules
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from lightning_fabric.strategies import DeepSpeedStrategy
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from lightning_fabric.plugins import DeepSpeedPrecision
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assert 'deepspeed' not in sys.modules
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import deepspeed
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assert 'deepspeed' in sys.modules
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"""
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)
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# run in complete isolation
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assert subprocess.call([sys.executable, "-c", code]) == 0
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