class_docstr: The next version of our playlist generator that uses the statistics
  generated from 'Episode 02' to improve the title recommendations.
  
  The flow performs the following steps:
  
  1) Load the genre-specific statistics from the MovieStatsFlow.
  2) In parallel branches:
     - A) Build a playlist from the top grossing films in the requested genre.
     - B) Choose a random movie.
  3) Join the two to create a movie playlist and display it.
docstr: Join our parallel branches and merge results.
docstr_tok: ["Join","our","parallel","branches","and","merge","results","."]
code: def join(self, inputs):
      """
      Join our parallel branches and merge results.
  
      """
      self.playlist = inputs.genre_movies.movies
      self.bonus = inputs.bonus_movie.bonus
  
      self.next(self.end)
  
file_path: metaflow/metaflow/tutorials/03-playlist-redux/playlist.py
imports: from metaflow import FlowSpec, step, Parameter
label_desc: Use image node_id 4 for calling the PlayListFlow obj's underlying member method code with example usage: obj.join(inputs) without return types