code: def get_random_rotation90():
      """Randomly rotate an image by multiples of 90 degrees."""
  
      def _random_rotation90(image):
          """Rotation function."""
          num_rotations = tf.random.uniform(
              shape=(), maxval=4, dtype=tf.int32
          )
          return tf.image.rot90(image, k=num_rotations)
  
      return _random_rotation90
  
imports: from typing import Optional, Tuple
  import numpy
  from scenic.dataset_lib.big_transfer.preprocessing import autoaugment
  from scenic.dataset_lib.big_transfer.preprocessing import utils
  from scenic.dataset_lib.big_transfer.registry import Registry
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_addons import image
label_desc: Use image node_id 21 for calling a global function with example usage: get_random_rotation90() and returns: _random_rotation90, tf