To improve question answering (QA) performance based on real-world web data sets, a new set of question classes and a general answer re-ranking model are defined.
为了改善真实网络数据集上自动问答系统的性能，定义出新的问题类别集合和通用的答案重新排序模型。
QA system contains three main procedures: question understanding, information retrieve and answer extraction.
问答系统中包括三个主要的部分：问题理解，信息检索和答案抽取。
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