code: def _encode_function_key(key: str) -> bytes:
      assert key.startswith(RUNTIME_ENV_FUNC_IDENTIFIER)
      return base64.b64decode(key[len(RUNTIME_ENV_FUNC_IDENTIFIER) :])
  
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 3 for calling a global function with example usage: _encode_function_key(key) and returns: base64