class_docstr: A rendezvous class for different actor/task processes to meet.
  
  To initialize an GLOO collective communication group, different
  actors/tasks spawned in Ray in a collective group needs to meet
  each other to synchronize the GLOOUniqueID. This class guarantees
  they meet via the GLOOUniqueIDStore, initialized on the rank=0
  process.
  
  Args:
      group_name: the unique user-specified group name.
code: def store_type(self):
      return self._store_type
  
imports: import datetime
  import logging
  import os
  import shutil
  import time
  import numpy
  import pygloo
  import ray
  from ray._private import ray_constants
  from ray.util.collective.collective_group import gloo_util
  from ray.util.collective.collective_group.base_collective_group import BaseGroup
  from ray.util.collective.const import get_store_name
  from ray.util.collective.types import AllGatherOptions, AllReduceOptions, Backend, BarrierOptions, BroadcastOptions, RecvOptions, ReduceOptions, ReduceScatterOptions, SendOptions
label_desc: Use image node_id 5 for calling the Rendezvous obj's underlying member method code with example usage: obj.store_type() and returns: self