code: def start_server(queue, is_async):
      """Start a server process."""
      server_process = multiprocessing.Process(
          target=server, args=(queue, is_async)
      )
      server_process.daemon = True
      server_process.start()
  
file_path: perspective/python/perspective/bench/tornado/async_server.py
imports: import multiprocessing
  import asyncio
  import os
  import os.path
  import perspective
  import time
  import tornado
  import threading
  import numpy
  from bench import PerspectiveTornadoBenchmark
label_desc: Use image node_id 5 for calling a global function with example usage: start_server(queue, is_async) without return types