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 is_initialized(cls):
      if cls.instance is None:
          return False
      return dist.is_initialized()
  
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 2 for calling the DistributedCommunicator obj's underlying member method code with example usage: obj.is_initialized(cls) and returns: dist, False