Dump the models into a list of strings. Each
        string is a text representation of a tree.

        Parameters
        ----------
        with_stats : bool
            If true, include node statistics in the output.

        Returns
        -------
        out : SFrame
            A table with two columns: feature, count,
            ordered by 'count' in descending order.

def _dump_to_text(self, with_stats):
        """
        Dump the models into a list of strings. Each
        string is a text representation of a tree.

        Parameters
        ----------
        with_stats : bool
            If true, include node statistics in the output.

        Returns
        -------
        out : SFrame
            A table with two columns: feature, count,
            ordered by 'count' in descending order.
        """
        return tc.extensions._xgboost_dump_model(self.__proxy__, with_stats=with_stats, format='text')