code: def _stub_unpickler():
      return "STUB"
  
file_path: pytorch/torch/utils/data/graph.py
imports: import io
  import pickle
  import warnings
  from collections.abc import Collection
  from typing import Dict, List, Optional, Set, Tuple, Type, Union
  from torch.utils.data import IterDataPipe, MapDataPipe
  from torch.utils.data._utils.serialization import DILL_AVAILABLE
label_desc: Use image node_id 1 for calling a global function with example usage: _stub_unpickler() and returns: str