code: def find_ip_and_free_port(pre_iter):
      from pyspark import BarrierTaskContext
  
      tc = BarrierTaskContext().get()
      infos = tc.getLocalProperty("addresses").split(",")
      address = infos[tc.partitionId()].split(":")[0]
      with closing(
          socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      ) as s:
          s.bind(("", 0))
          return [f"{address}:{s.getsockname()[1]}"]
  
imports: from contextlib import closing
  import socket
  import sys
  import tempfile
  import shutil
  from bigdl.dllib.utils import log4Error
  from bigdl.dllib.utils.common import callBigDlFunc
  from bigdl.dllib.utils.file_utils import get_file_list, is_local_path
  from bigdl.orca.data import SparkXShards
  from bigdl.orca.data.utils import get_size
  from bigdl.orca.data.file import put_local_dir_tree_to_remote, put_local_file_to_remote, get_remote_file_to_local, get_remote_dir_to_local
  from bigdl.dllib.utils.utils import convert_row_to_numpy
  from functools import partial
  import numpy
  from bigdl.orca.common import SafePickle
  import os
  import subprocess
  from bigdl.dllib.utils.log4Error import *
label_desc: Use image node_id 29 for calling a global function with example usage: find_ip_and_free_port(pre_iter) and returns: list