code: def start_tester(host, port, exit=None):
      if exit is None:
          exit = lambda _code: None
      tester = threading.Thread(
          target=_test_view, args=(host, port, exit)
      )
      tester.start()
  
file_path: guildai/guild/commands/view_tester.py
imports: import json
  import logging
  import sys
  import threading
  import time
  from guild import util
label_desc: Use image node_id 1 for calling a global function with example usage: start_tester(host, port, exit) without return types