code: def _set_env_vars(world_size, rank, local_rank):
      for key, default in [
          ("MASTER_ADDR", "127.0.0.1"),
          ("MASTER_PORT", "29500"),
      ]:
          if key not in os.environ:
              os.environ[key] = default
  
      os.environ["WORLD_SIZE"] = str(world_size)
      os.environ["RANK"] = str(rank)
      os.environ["LOCAL_RANK"] = str(local_rank)
  
file_path: audio/examples/source_separation/utils/dist_utils.py
imports: import csv
  import logging
  import os
  import types
  import torch
  import torch.distributed
label_desc: Use image node_id 4 for calling a global function with example usage: _set_env_vars(world_size, rank, local_rank) without return types