code: def preprocessing_fn(inputs):
      """tf.transform's callback function for preprocessing inputs.
  
      Args:
        inputs: map from feature keys to raw not-yet-transformed features.
  
      Returns:
        Map from string feature key to transformed feature operations.
      """
      return base.preprocessing_fn(inputs)
  
file_path: tfx/tfx/examples/mnist/mnist_utils_native_keras_lite.py
imports: import os
  import tensorflow
  import tensorflow_transform
  from tfx import v1
  from tfx.components.trainer.rewriting import converters
  from tfx.components.trainer.rewriting import rewriter
  from tfx.components.trainer.rewriting import rewriter_factory
  from tfx.examples.mnist import mnist_utils_native_keras_base
label_desc: Use image node_id 2 for calling a global function with example usage: preprocessing_fn(inputs) and returns: base