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09d8e80 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | # Copyright 2019 DeepMind Technologies Limited. All Rights Reserved.
#
# 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 cast pytrees to specific dtypes."""
from typing import Optional
import chex
from jax import tree_util as jtu
def tree_cast(
tree: chex.ArrayTree,
dtype: Optional[chex.ArrayDType]
) -> chex.ArrayTree:
"""Cast tree to given dtype, skip if None."""
if dtype is not None:
return jtu.tree_map(lambda t: t.astype(dtype), tree)
else:
return tree
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