code: def postprocess(X):
      X = X.copy()
      X = iutils.postprocess_images(X)
      return X
  
file_path: innvestigate/examples/utils/mnist.py
imports: from __future__ import annotations
  import numpy
  import tensorflow.keras
  from tensorflow.keras.backend import image_data_format
  from tensorflow.keras.datasets import mnist
  import innvestigate.utils
  import innvestigate.utils.visualizations
label_desc: Use image node_id 4 for calling a global function with example usage: postprocess(X) and returns: X