code: def signal_handler(signal, frame):
      logging.info("Stop launcher")
      sys.exit(0)
  
file_path: byteps/launcher/dist_launcher.py
imports: import argparse
  import os, sys
  import signal
  import logging
  import subprocess
  from multiprocessing import Pool, Process
  from threading import Thread
label_desc: Use image node_id 7 for calling a global function with example usage: signal_handler(signal, frame) without return types