class_docstr: The class that represents an uninitialized external storage.
class_docstr_tok: ["The","class","that","represents","an","uninitialized","external","storage","."]
code: def restore_spilled_objects(self, object_refs, url_with_offset_list):
      raise NotImplementedError("External storage is not initialized")
  
imports: import abc
  import logging
  import os
  import random
  import shutil
  import time
  import urllib
  import uuid
  from collections import namedtuple
  from typing import IO, List, Optional, Tuple
  import ray
  from ray._private.ray_constants import DEFAULT_OBJECT_PREFIX
  from ray._raylet import ObjectRef
label_desc: Use image node_id 2 for calling the NullStorage obj's underlying member method code with example usage: obj.restore_spilled_objects(object_refs, url_with_offset_list) without return types