code: def _decode_function_key(key: bytes) -> str:
      # b64encode only includes A-Z, a-z, 0-9, + and / characters
      return (
          RUNTIME_ENV_FUNC_IDENTIFIER + base64.b64encode(key).decode()
      )
  
file_path: ray/python/ray/_private/runtime_env/setup_hook.py
imports: import traceback
  import logging
  import base64
  import os
  from typing import Dict, Any, Callable, Union, Optional
  import ray
  import ray._private.ray_constants
  from ray._private.storage import _load_class
  import ray.cloudpickle
  from ray.runtime_env import RuntimeEnv
label_desc: Use image node_id 2 for calling a global function with example usage: _decode_function_key(key) and returns: unknown