code: def make_relative_timing_fn():
    
    start_time = time.time()
  
    def format_relative_time():
      time_delta = time.time() - start_time
      return str(datetime.timedelta(seconds=time_delta))
  
    def log_relative_time():
      tf.logging.info("Timing: %s", format_relative_time())
  
    return log_relative_time
docs: Make a function that logs the duration since it was made.