class_docstr: 8px to 64px problem.
class_docstr_tok: ["8px","to","64px","problem","."]
code: def preprocess_example(self, example, unused_mode, unused_hparams):
      image = example["inputs"]
      # Remove boundaries in CelebA images. Remove 40 pixels each side
      # vertically and 20 pixels each side horizontally.
      image = tf.image.crop_to_bounding_box(
          image, 40, 20, 218 - 80, 178 - 40
      )
      image_8 = image_utils.resize_by_area(image, 8)
      image_64 = image_utils.resize_by_area(image, 64)
  
      example["inputs"] = image_8
      example["targets"] = image_64
      return example
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import zipfile
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import image_utils
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the Img2imgCeleba64 obj's underlying member method code with example usage: obj.preprocess_example(example, unused_mode, unused_hparams) and returns: example