code: def randomString(stringLength=16):
      letters = string.ascii_lowercase
      return "".join(
          random.choice(letters) for i in range(stringLength)
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import re
  import os
  import ctypes
  from enum import Enum
  import random
  import string
  import warnings
  from tensorflow.python.framework import load_library
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import resource_loader
  from byteps.common import get_ext_suffix
  from byteps.common import BytePSBasics
  from byteps.tensorflow.util import _executing_eagerly
  import tensorflow
label_desc: Use image node_id 4 for calling a global function with example usage: randomString(stringLength) and returns: str