code: def write_storage(self, storage: torch.UntypedStorage) -> str:
      h = hash_storage(storage, stable_hash=self.stable_hash)
      if h in self.seen_storage_hashes:
          return h
      # TODO: consider not using torch.save for this; we don't actually
      # need any metadata for the storage
      subfolder = os.path.join(self.loc, "storages")
      os.makedirs(subfolder, exist_ok=True)
      target = os.path.join(subfolder, h)
      if os.path.exists(target):
          return h
      torch.save(storage, target)
      self.seen_storage_hashes.add(h)
      return h
  
imports: import ctypes
  import functools
  import hashlib
  import os.path
  import struct
  from collections import defaultdict
  from typing import Dict, Optional, Set
  import torch
  import torch._prims
  import torch._utils
  import torch.nn.functional
  from torch._C import default_generator
  from torch.multiprocessing.reductions import StorageWeakRef
label_desc: Use image node_id 2 for calling the ContentStoreWriter obj's underlying member method code with example usage: obj.write_storage(storage) and returns: h, h, h