code: def wait_for_ssh(ip):
      """Wait for SSH to be available at given IP address."""
      for _ in range(12):
          with safe_socket() as s:
              try:
                  s.connect((ip, 22))
                  return True
              except socket.timeout:
                  pass
          time.sleep(10)
      return False
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import contextlib
  import multiprocessing
  import os
  import socket
  import subprocess
  import time
  from tensor2tensor.utils import cloud_mlengine
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling a global function with example usage: wait_for_ssh(ip) and returns: False, True