Class 'Home\Controller\Redis' not found

thinkphp3.2不加” \ ” 会报 Class ‘Home\Controller\Redis’ not found

    $redis = new \Redis();
    $redis->connect('127.0.0.1',6379);
    $redis->set('name',1);
    $mylist =$redis->get('name');

    print_r($mylist);