code: def active_children():
      """
      Return list of process objects corresponding to live child processes
      """
      _cleanup()
      return list(_children)
  
imports: import os
  import sys
  import signal
  import itertools
  import threading
  from _weakrefset import WeakSet
label_desc: Use image node_id 2 for calling a global function with example usage: active_children() and returns: list