code: def delete_all_instances():
      return [
          delete_instance(name)
          for name in get_running_instance_names()
          if INSTANCE_NAME_PREFIX in name
      ]
  
file_path: ipyparallel/benchmarks/gcloud_setup.py
imports: import multiprocessing
  import os
  import sys
  from subprocess import Popen, check_call
  from time import sleep
  from typing import List
  import googleapiclient.discovery
  from benchmarks.utils import get_time_stamp
label_desc: Use image node_id 4 for calling a global function with example usage: delete_all_instances() and returns: unknown