Draw the embedded centers with their sizes on the visualization.

def draw(self):
        """
        Draw the embedded centers with their sizes on the visualization.
        """
        # Compute the sizes of the markers from their score
        sizes = self._get_cluster_sizes()

        # Draw the scatter plots with associated sizes on the graph
        self.ax.scatter(
            self.embedded_centers_[:,0], self.embedded_centers_[:,1],
            s=sizes, c=self.facecolor, edgecolor=self.edgecolor, linewidth=1,
        )

        # Annotate the clusters with their labels
        for i, pt in enumerate(self.embedded_centers_):
            self.ax.text(
                s=str(i), x=pt[0], y=pt[1], va="center", ha="center", fontweight="bold"
            )

        # Ensure the current axes is always the main residuals axes
        plt.sca(self.ax)
        return self.ax