class_docstr: Abstract base class representing a dataset.
docstr: Returns a picklable callable that recreates the dataset.
code: def get_factory(self):
      """Returns a picklable callable that recreates the dataset."""
  
      return Factory(type(self), self.kwargs)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import array
  import functools
  import gzip
  import operator
  import os
  import struct
  import tempfile
  import sys
  import warnings
  import numpy
  import tensorflow
  from cleverhans import utils
label_desc: Use image node_id 2 for calling the Dataset obj's underlying member method code with example usage: obj.get_factory() and returns: Factory