Run the iteration.

def Run(self):
    """Run the iteration."""
    count = 0
    for count, input_data in enumerate(self.GetInput()):
      if count % 2000 == 0:
        logging.debug("%d processed.", count)
      args = (input_data, self.out_queue, self.token)
      self.thread_pool.AddTask(
          target=self.IterFunction, args=args, name=self.THREAD_POOL_NAME)

    while count >= 0:
      try:
        # We only use the timeout to wait if we got to the end of the Queue but
        # didn't process everything yet.
        out = self.out_queue.get(timeout=self.QUEUE_TIMEOUT, block=True)
        if out:
          yield out
          count -= 1
      except queue.Empty:
        break

    # Join and stop to clean up the threadpool.
    self.thread_pool.Stop(join_timeout=THREADPOOL_JOIN_TIMEOUT)