code: def covar_plotter3d_matplotlib(embedding, rieman_metric, inspect_points_idx, ax,
                                 colors):
      
      for pts_idx in inspect_points_idx:
          plot_ellipse_matplotlib( cov=rieman_metric[pts_idx],
                               pos=embedding[pts_idx],
                               ax=ax, ec='k', lw=1,
                               color=colors[pts_idx] )
      return ax
docs: 3 Dimensional Covariance plotter using matplotlib backend.