code: def view_graph(graph_str, parent=None, prune_to=None):
      
      from rezgui.dialogs.ImageViewerDialog import ImageViewerDialog
      from rez.config import config
  
      # check for already written tempfile
      h = hash((graph_str, prune_to))
      filepath = graph_file_lookup.get(h)
      if filepath and not os.path.exists(filepath):
          filepath = None
  
      # write graph to tempfile
      if filepath is None:
          suffix = ".%s" % config.dot_image_format
          fd, filepath = tempfile.mkstemp(suffix=suffix, prefix="rez-graph-")
          os.close(fd)
  
          dlg = WriteGraphDialog(graph_str, filepath, parent, prune_to=prune_to)
          if not dlg.write_graph():
              return
  
      # display graph
      graph_file_lookup[h] = filepath
      dlg = ImageViewerDialog(filepath, parent)
      dlg.exec_()
docs: View a graph.