#
# For licensing see accompanying LICENSE file.
# Copyright (C) 2020 Apple Inc. All Rights Reserved.
#

from typing import Union, Optional


def make_divisible(v: Union[float, int],
                   divisor: Optional[int] = 8,
                   min_value: Optional[Union[float, int]] = None) -> Union[float, int]:
    """
    This function is taken from the original tf repo.
    It ensures that all layers have a channel number that is divisible by 8
    It can be seen here:
    https://github.com/tensorflow/models/blob/master/research/slim/nets/mobilenet/mobilenet.py
    :param v:
    :param divisor:
    :param min_value:
    :return:
    """
    if min_value is None:
        min_value = divisor
    new_v = max(min_value, int(v + divisor / 2) // divisor * divisor)
    # Make sure that round down does not go down by more than 10%.
    if new_v < 0.9 * v:
        new_v += divisor
    return new_v


def bound_fn(min_val: Union[float, int], max_val: Union[float, int], value: Union[float, int]) -> Union[float, int]:
    return max(min_val, min(max_val, value))
