docstr: reclaim the closed workers
docstr_tok: ["reclaim","the","closed","workers"]
code: def join(self):  # NOTE: ValueError on running pool
      "reclaim the closed workers"
      try:
          self._pool.join()
      except AttributeError:
          pass
  
label_desc: Use image node_id 7 for calling the Map obj's underlying member method code with example usage: obj.join() without return types