基本篇章单元(Elementary Discourse Units,EDU)识别对篇章分析工作意义重大,是构建篇章结构的基础。从篇章衔接性视角看,每个EDU都由要表达信息的起始点——主位和要传达的新信息——述位两部分构成。该文结合已有研究和汉语实际情况,给出了一个基于主述位理论的汉语基本篇章单元识别方法。该方法将EDU识别转化为主述位识别问题,由主位、述位的位置间接地确定EDU的边界,最终完成EDU的识别。而主、述位间具有明显的信息序列化特征,因此可通过序列化标注方法进行。基于主述位理论的汉语基本篇章单元识别方法更关注EDU作为一个独立的篇章单元的内部构成,在汉语篇章话题结构语料库CDTC上的实验也进一步验证了该方法的有效性,EDU识别的性能F1值达到了89.46%。
Abstract
Elementary Discourse Unit (EDU) recognition is a fundamental task of discourse analysis. This paper proposes a Chinese elementary discourse unit recognition approach based on theme-rheme theory, in which the identification of EDU is cast into the problem of theme-rheme recognition. Detecting theme and rheme can be conducted using sequence label approach, and after achieving the boundary of theme and rheme, we can merge them to get the EDU boundary. In contrast to related work on EDU recognition, our proposed approach can pay more attention on the internal structure of EDU. The experiments on the Chinese Discourse Topic Corpus (CDTC) show the effectiveness of our approach by the F1-score of 89.46%.
关键词
基本篇章单元 /
主位 /
述位 /
序列化标注
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Key words
elementary discourse unit /
theme /
rheme /
sequence label
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参考文献
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脚注
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基金
国家自然科学基金(61876118);人工智能应急项目(61751206);国家重点研发计划子课题(2017YFB1002101)
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