# Copyright 2022 The KerasCV Authors
#
# 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
#
#     https://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.

import tensorflow as tf


def scale_loss_for_distribution(loss_value):
    """Scales and returns the given loss value by the number of replicas."""
    num_replicas = tf.distribute.get_strategy().num_replicas_in_sync
    if num_replicas > 1:
        loss_value *= 1.0 / num_replicas
    return loss_value
