code: def setUp(self) -> None:
      os.environ["MASTER_ADDR"] = str(MASTER_ADDR)
      os.environ["MASTER_PORT"] = str(get_free_port())
      os.environ["GLOO_DEVICE_TRANSPORT"] = "TCP"
      os.environ["NCCL_SOCKET_IFNAME"] = "lo"
      self.WORLD_SIZE = 2
  
imports: import multiprocessing
  import os
  import unittest
  from typing import Callable
  from unittest import mock
  import torch.distributed
  from torch._utils_internal import TEST_MASTER_ADDR
  from torchrec.distributed.collective_utils import invoke_on_rank_and_broadcast_result, is_leader, run_on_leader
  from torchrec.test_utils import get_free_port, seed_and_log
label_desc: Use image node_id 1 for calling the CollectiveUtilsTest obj's underlying member method code with example usage: obj.setUp() without return types