code: def target_fn(port):
      image_server = SimpleServer(port=port)
      image_server.run()
  
file_path: pytorch-lightning/tests/tests_app/components/serve/test_python_server.py
imports: import multiprocessing
  from lightning.app.components import Category, Image, Number, PythonServer, Text
  from lightning.app.utilities.network import _configure_session, find_free_network_port
label_desc: Use image node_id 1 for calling a global function with example usage: target_fn(port) without return types