code: def hr_diagram(cluster_name, output=None):
      
      cluster = get_hr_data(cluster_name)
      pf = hr_diagram_figure(cluster)
      show_with_bokeh_server(pf)
docs: Create a :class:`~bokeh.plotting.figure.Figure` to create an H-R
      diagram using the cluster_name; then show it.
  
      Re