code: def _obj_id_to_key(object_id: str) -> str:
      return os.path.join(OBJECTS_DIR, object_id)
  
imports: import contextlib
  from dataclasses import dataclass
  import logging
  import os
  import ray
  from ray import cloudpickle
  from ray.types import ObjectRef
  from ray.workflow import common, workflow_storage
  from typing import Any, Dict, Generator, List, Optional, Tuple, TYPE_CHECKING
  from collections import ChainMap
  import io
label_desc: Use image node_id 3 for calling a global function with example usage: _obj_id_to_key(object_id) and returns: os