def METHOD_NAME(self, dir: Optional[str] = None) -> None:
    """
    Move output CSV files to specified directory.  If files were
    written to the temporary session directory, clean filename.
    E.g., save 'bernoulli-201912081451-1-5nm6as7u.csv' as
    'bernoulli-201912081451-1.csv'.
    :param dir: directory path
    See Also
    --------
    stanfit.RunSet.save_csvfiles
    cmdstanpy.from_csv
    """
    self.runset.METHOD_NAME(dir)