p->classno = classno;
auto features_gpu = features.gpu();，推荐阅读heLLoword翻译官方下载获取更多信息
public char* Method;，详情可参考夫子
// 栈不为空时才判断（避免访问stack.at(-1)时报错），推荐阅读旺商聊官方下载获取更多信息
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