观点句中评价对象/属性的缺省项识别方法研究

在多对象、多属性的评论文本中,评价对象和评价属性的缺省识别对于观点挖掘有着重要的作用。针对情感观点句中评价对象和评价属性的缺省问题,该文提出一种有效的缺省项识别方法。首先构造缺省项识别规则集,用于获取待识别的缺省项侯选集;将缺省项识别问题看作一个二元分类问题,选用词法和依存句法作为特征,使用决策树分类算法C4.5训练分类器模型,在测试集上对待识别的缺省项进行判别。实验结果表明,使用依存句法特征集分类的F值优于词法特征集约2%。将词法和依存句法两类特征融合与单类特征相比,分类精确率和F值分别提高了10%和5%左右,说明词法特征和依存句法特征的融合有利于缺省项识别。

Identify the Default for Comment Object/Attribute for Opinion Sentence

The identification of the default for comment object and coment attribute for opinion mining is important on multi objects, multi attributes review texts. This paper proposes a new method to deal with this issue. At first, the rule set of default item identification is constructed to obtain the candidate set of recognized default item. We treat the identification of the default item as a binary classification problem, and select the lexical and dependency parsing features. We employ the decision tree C4.5 algorithm to train classification model which was used to judge the recognized default item on the testing data. Experimental results show that the F-value of the classification of the dependency syntactic feature set is superior to the lexical feature set about 2%. Compared with the single feature, the accuracy and F-value of the integrating of two feature sets of lexical and dependency parsing increase up to 10% and 5%, respectively.