class_docstr: Use this class to manage the collective groups we created so far.
  
  Each process will have an instance of `GroupManager`. Each process
  could belong to multiple collective groups. The membership information
  and other metadata are stored in the global `_group_mgr` object.
class_docstr_tok: ["Use","this","class","to","manage","the","collective","groups","we","created","so","far",".","Each","process","will","have","an","instance","of","`","GroupManager","`",".","Each","process","could","belong","to","multiple","collective","groups",".","The","membership","information","and","other","metadata","are","stored","in","the","global","`","_group_mgr","`","object","."]
code: def is_group_exist(self, group_name):
      return group_name in self._name_group_map
  
imports: import logging
  import os
  from typing import List
  import numpy
  import ray
  from ray.util.collective import types
label_desc: Use image node_id 3 for calling the GroupManager obj's underlying member method code with example usage: obj.is_group_exist(group_name) and returns: unknown