code: def start_redis(self):
          
          assert self._redis_address is None
          redis_log_files = [self.new_log_files("redis")]
          for i in range(self._ray_params.num_redis_shards):
              redis_log_files.append(self.new_log_files("redis-shard_" + str(i)))
  
          (self._redis_address, redis_shards,
           process_infos) = ray.services.start_redis(
               self._node_ip_address,
               redis_log_files,
               port=self._ray_params.redis_port,
               redis_shard_ports=self._ray_params.redis_shard_ports,
               num_redis_shards=self._ray_params.num_redis_shards,
               redis_max_clients=self._ray_params.redis_max_clients,
               redirect_worker_output=True,
               password=self._ray_params.redis_password,
               include_java=self._ray_params.include_java,
               redis_max_memory=self._ray_params.redis_max_memory)
          assert (
              ray_constants.PROCESS_TYPE_REDIS_SERVER not in self.all_processes)
          self.all_processes[ray_constants.PROCESS_TYPE_REDIS_SERVER] = (
              process_infos)
docs: Start the Redis servers.