code: def _start_driver(self, num_cores: int, redis_address: str):
      print("Start to launch ray driver")
      import ray._private.services
  
      node_ip = ray._private.services.get_node_ip_address(redis_address)
      self._start_restricted_worker(
          num_cores=num_cores,
          node_ip_address=node_ip,
          redis_address=redis_address,
      )
      ray.shutdown()
      init_params = dict(
          address=redis_address,
          _node_ip_address=node_ip,
          namespace="bigdl",
      )
      if self.redis_password:
          init_params["_redis_password"] = self.redis_password
      return ray.init(**init_params)
  
imports: import os
  import re
  import subprocess
  import time
  import uuid
  import random
  import warnings
  import tempfile
  import filelock
  import multiprocessing
  from packaging import version
  from bigdl.orca.ray.process import session_execute, ProcessMonitor
  from bigdl.orca.ray.utils import is_local
  from bigdl.orca.ray.utils import resource_to_bytes
  from bigdl.orca.ray.utils import get_parent_pid
  from bigdl.dllib.utils.log4Error import invalidInputError
  from typing import TYPE_CHECKING
  from typing import Any, Dict, Optional, List
label_desc: Use image node_id 14 for calling the RayOnSparkContext obj's underlying member method code with example usage: obj._start_driver(num_cores, redis_address) and returns: ray