code: def cluster_id():
      return str(time.time())
  
imports: import logging
  import os
  import sys
  import time
  from subprocess import Popen
  import entrypoints
  import pytest
  from traitlets.config import Config
  from ipyparallel.cluster import launcher
label_desc: Use image node_id 2 for calling a global function with example usage: cluster_id() and returns: str