code: def barrier(group_name: str = "default"):
      """Barrier all processes in the collective group.
  
      Args:
          group_name: the name of the group to barrier.
  
      Returns:
          None
      """
      g = _check_and_get_group(group_name)
      g.barrier()
  
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 11 for calling a global function with example usage: barrier(group_name) without return types