docstr: Blocks until all processes reach this barrier.
  
  Args:
      barrier_options: barrier options.
  
  Returns:
      None
docstr_tok: ["Blocks","until","all","processes","reach","this","barrier",".","Args",":","barrier_options",":","barrier","options",".","Returns",":","None"]
code: def barrier(self, barrier_options=BarrierOptions()):
      """Blocks until all processes reach this barrier.
  
      Args:
          barrier_options: barrier options.
  
      Returns:
          None
      """
      barrier_tensor = numpy.array([1])
      self.allreduce([barrier_tensor])
  
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 GLOOGroup obj's underlying member method code with example usage: obj.barrier(barrier_options) without return types