code: def start_dashboard(self):
          
          stdout_file, stderr_file = self.new_log_files("dashboard", True)
          self._webui_url, process_info = ray.services.start_dashboard(
              self.redis_address,
              self._temp_dir,
              stdout_file=stdout_file,
              stderr_file=stderr_file,
              redis_password=self._ray_params.redis_password)
          assert ray_constants.PROCESS_TYPE_DASHBOARD not in self.all_processes
          if process_info is not None:
              self.all_processes[ray_constants.PROCESS_TYPE_DASHBOARD] = [
                  process_info
              ]
              redis_client = self.create_redis_client()
              redis_client.hmset("webui", {"url": self._webui_url})
docs: Start the dashboard.