摘要
开放领域的问答系统是自然语言处理领域中具有挑战性的研究方向。答案抽取是问答系统的关键,在基于模式匹配的答案抽取方法中,答案是借助于问题的答案模式抽取得到,因此,答案模式的评价对候选答案排序及答案的最终选择起着决定性的作用。参照传统的答案模式评价方法,提出一种改进的模式评价方法,分别在传统和改进两种答案模式评价方法下进行了答案抽取实验。实验结果表明应用改进的答案模式评价方法,答案抽取性能明显提高。
The question-and-answer system in open domain is a challenging research orientation in natural language processing field. Answer extraction is the key of the question-and-answer system. In the answer extraction method based on pattern matching, the answer is extracted by means of the pattern of the answer to the question. Therefore, the evaluation of the pattern of the answer plays a decisive role in the ranking of candidate answers and final selection of answers. By reference to the traditional evaluation method, we put forward a new method of pattern evaluation, that is, carrying out answer extraction experiment separately in the traditional and improved pattern evaluation methods. The experimental results show that the improved pattern evaluation method improves the performance of answer extraction markedly.
出处
《情报理论与实践》
CSSCI
北大核心
2009年第9期105-108,共4页
Information Studies:Theory & Application
关键词
问答系统
模式匹配
答案抽取
question-and-answer system
pattern matching
answer extraction
