code: def get_title(page):
      """Extract the title from a page.
  
      Args:
        page: a string
      Returns:
        a string
      """
      start_pos = page.find("<title>")
      end_pos = page.find("</title>")
      assert start_pos != -1
      assert end_pos != -1
      start_pos += len("<title>")
      return page[start_pos:end_pos]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import os
  import random
  import re
  import subprocess
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import text_encoder
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling a global function with example usage: get_title(page) and returns: page