def add_params(param_list_left, param_list_right):
    """Add two lists of parameters one by one

    :param param_list_left: list of numpy arrays
    :param param_list_right: list of numpy arrays
    :return: list of numpy arrays
    """
    res = []
    for x, y in zip(param_list_left, param_list_right):
        res.append(x + y)
    return res
