(self)
return None
Get the failed trial callback function.

        Returns:
            The failed trial callback function if it is set, otherwise :obj:`None`.
Get the failed trial callback function.
Get the failed trial callback function .
def get_failed_trial_callback(self) -> Optional[Callable[["optuna.Study", FrozenTrial], None]]:
        """Get the failed trial callback function.

        Returns:
            The failed trial callback function if it is set, otherwise :obj:`None`.
        """
        return None
def get_failed_trial_callback ( self ) -> Optional [ Callable [ [ "optuna.Study" , FrozenTrial ] , None ] ] : return None