code: def find_free_port():
      import socket
      from contextlib import closing
  
      with closing(
          socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      ) as s:
          s.bind(("", 0))
          s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
          return s.getsockname()[1]
  
imports: import time
  import argparse
  import tensorflow
  import os
  import sys
  import math
  import collections
  from tensorflow.python.client import timeline
  import json
  from tensorflow.python.ops import partitioned_variables
  import ray
  from bigdl.dllib.utils.log4Error import *
  from bigdl.orca import init_orca_context, stop_orca_context, OrcaContext
  from bigdl.orca.data.utils import process_spark_xshards
  from bigdl.orca.learn.utils import maybe_dataframe_to_xshards
  from bigdl.friesian.feature import FeatureTable
label_desc: Use image node_id 8 for calling a global function with example usage: find_free_port() and returns: s