code: def start_client_timeout(ip_config, group_id=0, num_servers=1):
      dgl.distributed.register_service(
          TIMEOUT_SERVICE_ID, TimeoutRequest, TimeoutResponse
      )
      dgl.distributed.connect_to_server(
          ip_config=ip_config,
          num_servers=num_servers,
          group_id=group_id,
      )
      timeout = 1 * 1000  # milliseconds
      req = TimeoutRequest(TIMEOUT_META, timeout)
      # test send and recv
      dgl.distributed.send_request(0, req)
      res = dgl.distributed.recv_response(timeout=int(timeout / 2))
      assert res is None
      res = dgl.distributed.recv_response()
      assert res.meta == TIMEOUT_META
      # test remote_call
      req = TimeoutRequest(TIMEOUT_META, timeout, response=False)
      target_and_requests = []
      for i in range(3):
          target_and_requests.append((0, req))
      expect_except = False
      try:
          res_list = dgl.distributed.remote_call(
              target_and_requests, timeout=int(timeout / 2)
          )
      except dgl.DGLError:
          expect_except = True
      assert expect_except
      # test send_request_to_machine
      req = TimeoutRequest(TIMEOUT_META, timeout)
      dgl.distributed.send_request_to_machine(0, req)
      res = dgl.distributed.recv_response(timeout=int(timeout / 2))
      assert res is None
      res = dgl.distributed.recv_response()
      assert res.meta == TIMEOUT_META
      # test remote_call_to_machine
      req = TimeoutRequest(TIMEOUT_META, timeout, response=False)
      target_and_requests = []
      for i in range(3):
          target_and_requests.append((0, req))
      expect_except = False
      try:
          res_list = dgl.distributed.remote_call_to_machine(
              target_and_requests, timeout=int(timeout / 2)
          )
      except dgl.DGLError:
          expect_except = True
      assert expect_except
  
imports: import multiprocessing
  import os
  import socket
  import time
  import unittest
  import backend
  import dgl
  import pytest
  from numpy.testing import assert_array_equal
  from utils import generate_ip_config, reset_envs
label_desc: Use image node_id 5 for calling a global function with example usage: start_client_timeout(ip_config, group_id, num_servers) without return types