code: def process_request(self, server_state):
      assert self.meta == TIMEOUT_META
      # convert from milliseconds to seconds
      time.sleep(self.timeout / 1000)
      if not self.response:
          return None
      res = TimeoutResponse(self.meta)
      return res
  
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 4 for calling the TimeoutRequest obj's underlying member method code with example usage: obj.process_request(server_state) and returns: res, None