code: def read_png(filename):
      """Loads a PNG image file."""
      string = tf.io.read_file(filename)
      image = tf.image.decode_image(string, channels=3)
      return tf.expand_dims(image, 0)
  
imports: import argparse
  import io
  import os
  import sys
  import urllib
  from absl import app
  from absl.flags import argparse_flags
  import numpy
  import tensorflow
  import tensorflow_compression
label_desc: Use image node_id 1 for calling a global function with example usage: read_png(filename) and returns: tf