import json


def linear_scaling(x):
    return (x * 255.) / 127.5 - 1.


def linear_unscaling(x):
    return (x + 1.) * 127.5 / 255.


def read_json(path):
    """
    :param path (str or os.Path): JSON file path.
    :return: (Dict): the data in the JSON file.
    """
    with open(path) as f:
        data = json.load(f)
    return data


def write_json(path, datagroup):
    """
    :param path (str or os.Path): File path for the output JSON file.
    :param datagroup (Dict): The data which should be dump to the JSON file.
    :return: void.
    """
    with open(path, "w+") as f:
        json.dump(datagroup, f)