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1# Copyright 2019 The TensorFlow Authors. All Rights Reserved.
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#     http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14# ==============================================================================
15"""Contains global variables related to mixed precision.
16
17This is not part of mixed_precision.py to avoid a circular dependency.
18mixed_precision.py depends on Session, and Session depends on this file.
19"""
20
21from __future__ import absolute_import
22from __future__ import division
23from __future__ import print_function
24
25
26# Whether the mixed precision graph rewrite has been enabled or not with
27# `enable_mixed_precision_graph_rewrite`. Used to turn on auto_mixed_precision
28# in ConfigProtos passed to Sessions.
29mixed_precision_graph_rewrite_is_enabled = False
30
31# True if a Session has been created without the mixed precision graph rewrite
32# being enabled. Used to give a warning if mixed precision is enabled after a
33# Session has already been created.
34non_mixed_precision_session_created = False
35
36# Whether the global tf.keras.mixed_precision.Policy uses mixed precision. Used
37# to raise an error message if both a mixed Policy and the graph rewrite are
38# used at the same time.
39using_mixed_precision_policy = False
40