中文摘要：

多词表达的识别错误会对很多自然语言处理任务造成不利影响。DE-Tri-Training半指导聚类算法在聚类初期使用有指导的标注信息,取得了较好的抽取结果。本文采用基于中心词扩展的初始聚类中心确定方法和基于有指导信息的一致性协同学习数据净化方法,提出了半指导策略抽取汉语多词表达,聚类算法的中后期也加入有指导的信息,使分类器能使用正确的标注信息进行训练。通过与DETri-Training算法的对比实验,改进的DE-Tri-Training算法得到的汉语多词表达抽取结果优于原来的算法,验证了改进DE-Tri-Training算法的有效性。

英文摘要：

Failing to identify multiword expression（MWE）may cause serious problems for many natural language processing（NLP）tasks.Because of lacking of Chinese MWE tagging corpus,a semi supervised method is used to extract Chinese MWE.DE-Tri-Training semi-supervised clustering algorithm uses supervised information in the beginning of the cluster,and obtains good results.The selection method of original cluster center based head word expansion and the consistency collaborative learning data depuration method based supervised information are proposed,which adds the supervised information into the mid and late steps of clustering,so that classifiers can use correct label information to train it.The contrast experiment show that the extraction results of Chinese multi-word expression using the improved DE-Tri-Training algorithm are better than that of using unimproved one.The effectiveness of the improved DE-Tri-Training algorithm is thus verified.