code: def main():
      parser = argparse.ArgumentParser()
  
      def aa(*args, **kwargs):
          group.add_argument(*args, **kwargs)
  
      group = parser.add_argument_group("server options")
      aa("--port", default=12012, type=int, help="server port")
      aa(
          "--when_ready_dir",
          default=None,
          help="store host:port to this file when ready",
      )
      aa(
          "--ipv4",
          default=False,
          action="store_true",
          help="force ipv4",
      )
      aa(
          "--rank",
          default=0,
          type=int,
          help="rank used as index in the client table",
      )
  
      args = parser.parse_args()
  
      when_ready = None
      if args.when_ready_dir:
          when_ready = "%s/%d" % (args.when_ready_dir, args.rank)
  
      print("loading index")
  
      index = combined_index.CombinedIndexDeep1B()
  
      print("starting server")
      rpc.run_server(
          lambda s: MyServer(s, index),
          args.port,
          report_to_file=when_ready,
          v6=not args.ipv4,
      )
  
imports: import time
  from faiss.contrib import rpc
  import combined_index
  import argparse
  from multiprocessing.pool import ThreadPool
  import faiss
  import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types