def get_virtual_ground_truth(
        self,
        user_table_name: str,
        user_schema_mapping: Dict[str, str],
        user_schema_name: Optional[str] = None,
    ) -> pd.DataFrame:
        """Get all virtual ground truths from the database from a particular user table's name.

        Returns:
            A dataframe with the virtual ground truths.
        """
        raise NotImplementedError()
Get all virtual ground truths from the database from a particular user table's name.

        Returns:
            A dataframe with the virtual ground truths.
        
src/core/trulens/core/database/base.py