def descale(data, data_max, data_min):
    """Reverse normalization

    Args:
        data (np.array): Normalized data
        data_max (float): max value before normalization
        data_min (float): min value before normalization

    Returns:
        [np.array]: Reverse-Normalized data
    """
    data_descaled = data*(data_max-data_min)+data_min
    return data_descaled