code: def write_executor_id(num):
      """Write executor_id into a local file in the executor's current working directory"""
      with open("executor_id", "w") as f:
          f.write(str(num))
  
file_path: TensorFlowOnSpark/tensorflowonspark/util.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import nested_scopes
  from __future__ import print_function
  import logging
  import os
  import socket
  import subprocess
  import errno
  from socket import error
  from .None import gpu_info
label_desc: Use image node_id 4 for calling a global function with example usage: write_executor_id(num) without return types