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# Copyright The Lightning AI 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.
"""Utilities to help with reproducibility of models."""
from collections.abc import Generator
from contextlib import contextmanager
from lightning_fabric.utilities.seed import _collect_rng_states, _set_rng_states
@contextmanager
def isolate_rng(include_cuda: bool = True) -> Generator[None, None, None]:
"""A context manager that resets the global random state on exit to what it was before entering.
It supports isolating the states for PyTorch, Numpy, and Python built-in random number generators.
Args:
include_cuda: Whether to allow this function to also control the `torch.cuda` random number generator.
Set this to ``False`` when using the function in a forked process where CUDA re-initialization is
prohibited.
Example:
>>> import torch
>>> torch.manual_seed(1) # doctest: +ELLIPSIS
<torch._C.Generator object at ...>
>>> with isolate_rng():
... [torch.rand(1) for _ in range(3)]
[tensor([0.7576]), tensor([0.2793]), tensor([0.4031])]
>>> torch.rand(1)
tensor([0.7576])
"""
states = _collect_rng_states(include_cuda)
yield
_set_rng_states(states)
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