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A PRNG implementation is determined by a key shape and a set of basic functions on such a key: seed, split, random_bits, and fold_in. A PRNG implementation can then by lifted to an array-of-keys-like object. Namely, a new internal pytree class PRNGKeyArray wraps the implementation and maintains an array of keys of the right shape. This array-like object is the new "key" that gets passed around the various functions in the public random API (e.g. `random.uniform`, `random.normal`, ...). So the PRNGKeyArray class really serves two purposes at once: 1. To adapt key implementations into "arrays" of such keys. 2. To carry a reference to the PRNG implementation around and delegate back to it from the functions in random.
23 lines
693 B
Python
23 lines
693 B
Python
# Copyright 2021 Google LLC
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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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# https://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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# flake8: noqa: F401
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from jax._src.prng import (
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threefry2x32_p,
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threefry_2x32,
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PRNGImpl,
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seed_with_impl,
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)
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