content: def add_visualization_arguments(parser):
      parser.add_argument(
          '-o', '--output',
          default="graph.html",
          type=str,
          help="filename of the output path, e.g. 'graph.html")
      parser.add_argument(
          '-m', '--max_history',
          default=2,
          type=int,
          help="max history to consider when merging "
               "paths in the output graph")
      parser.add_argument(
          '-nlu', '--nlu_data',
          default=None,
          type=str,
          help="path of the Rasa NLU training data, "
               "used to insert example messages into the graph")
  