docstr: Function needed to be used as an iterator.
code: def __iter__(self):
      """Function needed to be used as an iterator."""
      return self
  
imports: import abc
  import glob
  import logging
  import os
  import shelve
  import shutil
  import tempfile
  from datetime import datetime
  import numpy
  import tensorflow
  from .graph_partitioner import PARTITION_ALGO_REGISTRY, AbstractGraphPartitioner
label_desc: Use image node_id 11 for calling the PartitionDataManager obj's underlying member method code with example usage: obj.__iter__() and returns: self