code: def is_valid_ip_address(ip):
      pattern = r"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$"
      return re.match(pattern, ip) is not None
  
imports: import glob
  from bigdl.dllib.utils.file_utils import Sample
  import numpy
  from pyspark.ml.linalg import DenseVector, SparseVector, VectorUDT
  import sys
  import os
  import re
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 17 for calling a global function with example usage: is_valid_ip_address(ip) and returns: unknown