class_docstr: Fashion MNIST.
code: def preprocess_example(self, example, mode, unused_hparams):
      image = example["inputs"]
      image.set_shape([_MNIST_IMAGE_SIZE, _MNIST_IMAGE_SIZE, 1])
      example["inputs"] = image
      return example
  
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 6 for calling the ImageFashionMnist obj's underlying member method code with example usage: obj.preprocess_example(example, mode, unused_hparams) and returns: example