class_docstr: Abstract base class representing a dataset.
docstr: Returns the training set or test set as an (x_data, y_data) tuple.
  :param which_set: 'train' or 'test'
code: def get_set(self, which_set):
      """Returns the training set or test set as an (x_data, y_data) tuple.
      :param which_set: 'train' or 'test'
      """
      return (
          getattr(self, "x_" + which_set),
          getattr(self, "y_" + which_set),
      )
  
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 3 for calling the Dataset obj's underlying member method code with example usage: obj.get_set(which_set) and returns: getattr,  getattr