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 tensorflow.python.util.tf_export import tf_export
22
23# Whether the mixed precision graph rewrite has been enabled or not with
24# `enable_mixed_precision_graph_rewrite`. Used to turn on auto_mixed_precision
25# in ConfigProtos passed to Sessions.
26_mixed_precision_graph_rewrite_is_enabled = False
27
28
29# True if a Session has been created without the mixed precision graph rewrite
30# being enabled. Used to give a warning if mixed precision is enabled after a
31# Session has already been created.
32_non_mixed_precision_session_created = False
33
34# Whether the global tf.keras.mixed_precision.Policy uses mixed precision. Used
35# to raise an error message if both a mixed Policy and the graph rewrite are
36# used at the same time.
37_using_mixed_precision_policy = False
38
39
40@tf_export('__internal__.train.is_mixed_precision_graph_rewrite_enabled', v1=[])
41def is_mixed_precision_graph_rewrite_enabled():
42  return _mixed_precision_graph_rewrite_is_enabled
43
44
45def set_mixed_precision_graph_rewrite_enabled(enabled):
46  global _mixed_precision_graph_rewrite_is_enabled
47  _mixed_precision_graph_rewrite_is_enabled = enabled
48
49
50def non_mixed_precision_session_created():
51  return _non_mixed_precision_session_created
52
53
54def set_non_mixed_precision_session_created(created):
55  global _non_mixed_precision_session_created
56  _non_mixed_precision_session_created = created
57
58
59def is_using_mixed_precision_policy():
60  return _using_mixed_precision_policy
61
62
63@tf_export('__internal__.train.set_using_mixed_precision_policy', v1=[])
64def set_using_mixed_precision_policy(is_using):
65  global _using_mixed_precision_policy
66  _using_mixed_precision_policy = is_using
67