class_docstr: Fashion MNIST.
code: def class_labels(self):
      return [str(c) for c in range(self.num_classes)]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import gzip
  import os
  import random
  import numpy
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import image_utils
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling the ImageFashionMnist obj's underlying member method code with example usage: obj.class_labels() and returns: unknown