code: def setup_ddp(rank, world_size):
      """Setup ddp enviroment"""
      os.environ["MASTER_ADDR"] = "localhost"
      os.environ["MASTER_PORT"] = "8088"
  
      if torch.distributed.is_available() and sys.platform not in [
          "win32",
          "cygwin",
      ]:
          torch.distributed.init_process_group(
              "gloo", rank=rank, world_size=world_size
          )
  
imports: import os
  import pickle
  import sys
  from functools import partial
  from typing import Callable, Optional
  import numpy
  import pytest
  import torch
  from scipy.stats import entropy
  from torch.distributions.utils import logits_to_probs
  from torch.multiprocessing import Pool, set_start_method
  from torchmetrics import Metric
  from nemo.collections.common.metrics import GlobalAverageLossMetric, Perplexity
label_desc: Use image node_id 1 for calling a global function with example usage: setup_ddp(rank, world_size) without return types