Add method specific options to CLI parser.

    Parameters
    ----------
    parser : argparse object

    Returns
    ----------
    Updated argparse object

def cli_parse(parser):
    """Add method specific options to CLI parser.

    Parameters
    ----------
    parser : argparse object

    Returns
    ----------
    Updated argparse object
    """
    parser.add_argument('-n', '--samples', type=int, required=True,
                        help='Number of Samples')
    return parser