# 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.
# ==============================================================================
"""Tests for LossScaleOptimizer."""

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

import os

from absl.testing import parameterized

from tensorflow.python.distribute import distribution_strategy_context
from tensorflow.python.distribute import mirrored_strategy
from tensorflow.python.eager import context
from tensorflow.python.framework import test_util
from tensorflow.python.keras.mixed_precision.experimental import loss_scale as loss_scale_module
from tensorflow.python.keras.mixed_precision.experimental import loss_scale_optimizer
from tensorflow.python.keras.mixed_precision.experimental import test_util as mp_test_util
from tensorflow.python.keras.optimizer_v2 import gradient_descent
from tensorflow.python.ops import resource_variable_ops
from tensorflow.python.ops import variables
from tensorflow.python.platform import test
from tensorflow.python.training.tracking import util as trackable_utils


# If called outside any strategy.scope() calls, this will return the default
# strategy.
default_strategy_fn = distribution_strategy_context.get_strategy


def create_mirrored_strategy():