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DataLoader2 initial support for randomness control (pytorch#801)
Summary: Pull Request resolved: pytorch#801 Add the initial support for DataLoader2 to control randomness over the pipeline: - Implement `SeedGenerator` - Change API of `ReadingService` to take seed generator from DataLoader2 Differential Revision: D38947827 fbshipit-source-id: 17db1e13fe8685f6b2817f72c0e199edfaf3a3a1
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# Copyright (c) Meta Platforms, Inc. and affiliates. | ||
# All rights reserved. | ||
# | ||
# This source code is licensed under the BSD-style license found in the | ||
# LICENSE file in the root directory of this source tree. | ||
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from typing import Optional | ||
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import torch | ||
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__all__ = ["SeedGenerator"] | ||
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class SeedGenerator: | ||
def __init__(self, seed=None) -> None: | ||
self._rng = torch.Generator() | ||
if seed is not None: | ||
self._rng.manual_seed(seed) | ||
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def seed(self, seed: int) -> None: | ||
self._rng.manual_seed(seed) | ||
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def generate(self) -> int: | ||
return int(torch.empty((), dtype=torch.int64).random_(generator=self._rng).item()) | ||
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def spawn(self, process_id: int) -> "SeedGenerator": | ||
return SeedGenerator() | ||
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def __getstate__(self): | ||
state = {"_rng_state": self._rng.get_state} | ||
return state | ||
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def __setstate__(self, state): | ||
self._rng = torch.Generator() | ||
rng_state = state["_rng_state"] | ||
self._rng.set_state(rng_state) |
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