code: def _set_datapipe_valid_iterator_id(datapipe):
      """Given a DataPipe, updates its valid iterator ID and reset the DataPipe."""
      if (
          hasattr(datapipe, "_is_child_datapipe")
          and datapipe._is_child_datapipe is True
      ):
          if hasattr(datapipe, "_set_main_datapipe_valid_iterator_id"):
              datapipe._set_main_datapipe_valid_iterator_id()  # reset() is called within this method when appropriate
          else:
              raise RuntimeError(
                  "ChildDataPipe must have method `_set_main_datapipe_valid_iterator_id`."
              )
      else:
          if datapipe._valid_iterator_id is None:
              datapipe._valid_iterator_id = 0
          else:
              datapipe._valid_iterator_id += 1
          datapipe.reset()
      return datapipe._valid_iterator_id
  
file_path: pytorch/torch/utils/data/datapipes/_hook_iterator.py
imports: import inspect
  import functools
  from enum import Enum
  import torch.autograd
label_desc: Use image node_id 7 for calling a global function with example usage: _set_datapipe_valid_iterator_id(datapipe) and returns: datapipe