code: def batch_standardize(frames):
      return tf.map_fn(
          lambda frame: tf.image.per_image_standardization(frame),
          frames,
      )
  
file_path: attributionpriors/attributionpriors/mnist/mnist_train.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  import tensorflow
  import numpy
  import tensorflow.contrib.slim
  import datetime
  import mnist_model
  import mnist_reader
  from attributionpriors.ops import AttributionPriorExplainer
label_desc: Use image node_id 1 for calling a global function with example usage: batch_standardize(frames) and returns: tf