code: def _check_env_variable(key: str, new_value: str):
      # Only check for difference with preset environment variables
      if key in os.environ and os.environ[key] != new_value:
          raise RuntimeError(
              f"Cannot export environment variables as {key} is already set"
          )
  
imports: import os
  import random
  import re
  import socket
  from typing import Dict, List
  import torch
  import torch.distributed
label_desc: Use image node_id 13 for calling a global function with example usage: _check_env_variable(key, new_value) without return types