class_docstr: Implementation of the Communicator class via torch.distributed. Use this
  communicator to communicate between different processes, potentially,
  running on different nodes.
code: def shutdown(cls):
      if dist.get_rank() == 0 and cls.instance.ttp_initialized:
          cls.instance.send_obj(
              "terminate",
              cls.instance.get_ttp_rank(),
              cls.instance.ttp_group,
          )
      dist.destroy_process_group(cls.instance.main_group)
      dist.destroy_process_group(cls.instance.ttp_group)
      dist.destroy_process_group()
      cls.instance = None
  
imports: import logging
  import os
  import pickle
  import random
  import string
  import numpy
  import torch
  import torch.distributed
  from crypten.common import serial
  from torch.distributed import ReduceOp
  from .communicator import _logging, Communicator
label_desc: Use image node_id 5 for calling the DistributedCommunicator obj's underlying member method code with example usage: obj.shutdown(cls) without return types