Finalize the drawing by adding a title and legend, and removing the
        axes objects that do not convey information about TNSE.

def finalize(self, **kwargs):
        """
        Finalize the drawing by adding a title and legend, and removing the
        axes objects that do not convey information about TNSE.
        """
        self.set_title(
            "TSNE Projection of {} Documents".format(self.n_instances_)
        )

        # Remove the ticks
        self.ax.set_yticks([])
        self.ax.set_xticks([])

        # Add the legend outside of the figure box.
        if not all(self.classes_ == np.array([self.NULL_CLASS])):
            box = self.ax.get_position()
            self.ax.set_position([box.x0, box.y0, box.width * 0.8, box.height])
            manual_legend(
                self, self.classes_, self.color_values_,
                loc='center left', bbox_to_anchor=(1, 0.5)
            )