class_docstr: Stores data in temp buckets, restitute it shuffled.
code: def _iter_mem(self):
      for hkey, data in sorted(self._mem_buffer):
          yield hkey, data
  
imports: import math
  import os
  import struct
  from typing import Iterator, List, Optional
  import uuid
  from absl import logging
  import six
  from tensorflow_datasets.core import hashing
  from tensorflow_datasets.core.utils import file_utils
  from tensorflow_datasets.core.utils import type_utils
  from tensorflow_datasets.core.utils.lazy_imports_utils import tensorflow
label_desc: Use image node_id 8 for calling the Shuffler obj's underlying member method code with example usage: obj._iter_mem() without return types