(self)
return len(self.directions) > 1
Return :obj:`True` if the study has multiple objectives.

        Returns:
            A boolean value indicates if `self.directions` has more than 1 element or not.
Return :obj:`True` if the study has multiple objectives.
Return : obj : True if the study has multiple objectives .
def _is_multi_objective(self) -> bool:
        """Return :obj:`True` if the study has multiple objectives.

        Returns:
            A boolean value indicates if `self.directions` has more than 1 element or not.
        """

        return len(self.directions) > 1
def _is_multi_objective ( self ) -> bool : return len ( self . directions ) > 1