code: def encode(s):
      return bytes(s, "utf-8")
  
imports: import datetime
  import json
  import math
  import multiprocessing
  import os
  import random
  import asyncio
  import aiohttp
  import tensorflow
  from tensor2tensor.data_generators.wikisum import html
  from tensor2tensor.data_generators.wikisum import utils
label_desc: Use image node_id 4 for calling a global function with example usage: encode(s) and returns: bytes