Initializes the choice of X and Y based on the selected initial design and number of points selected.

def _init_design_chooser(self):
        """
        Initializes the choice of X and Y based on the selected initial design and number of points selected.
        """

        # If objective function was not provided, we require some initial sample data
        if self.f is None and (self.X is None or self.Y is None):
            raise InvalidConfigError("Initial data for both X and Y is required when objective function is not provided")

        # Case 1:
        if self.X is None:
            self.X = initial_design(self.initial_design_type, self.space, self.initial_design_numdata)
            self.Y, _ = self.objective.evaluate(self.X)
        # Case 2
        elif self.X is not None and self.Y is None:
            self.Y, _ = self.objective.evaluate(self.X)