code: def free_display():
      """Stop virtual display (if it is up)"""
      from .. import config
  
      config.stop_display()
  
imports: import os
  import sys
  import errno
  import atexit
  from warnings import warn
  from looseversion import LooseVersion
  import configparser
  import numpy
  from simplejson import load, dump
  from .misc import str2bool
  from filelock import SoftFileLock
label_desc: Use image node_id 2 for calling a global function with example usage: free_display() without return types