# Copyright 2019 The TensorFlow Authors. 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.
# ==============================================================================
"""Contains global variables related to mixed precision.

This is not part of mixed_precision.py to avoid a circular dependency.
mixed_precision.py depends on Session, and Session depends on this file.
"""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function


# Whether the mixed precision graph rewrite has been enabled or not with
# `enable_mixed_precision_graph_rewrite`. Used to turn on auto_mixed_precision
# in ConfigProtos passed to Sessions.
mixed_precision_graph_rewrite_is_enabled = False

# True if a Session has been created without the mixed precision graph rewrite
# being enabled. Used to give a warning if mixed precision is enabled after a
# Session has already been created.
non_mixed_precision_session_created = False

# Whether the global tf.keras.mixed_precision.Policy uses mixed precision. Used
# to raise an error message if both a mixed Policy and the graph rewrite are
# used at the same time.
using_mixed_precision_policy = False