tailieunhanh - Báo cáo khoa học: "Employing Personal/Impersonal Views in Supervised and Semi-supervised Sentiment Classification"

In this paper, we adopt two views, personal and impersonal views, and systematically employ them in both supervised and semi-supervised sentiment classification. Here, personal views consist of those sentences which directly express speaker’s feeling and preference towards a target object while impersonal views focus on statements towards a target object for evaluation. To obtain them, an unsupervised mining approach is proposed. | Employing Personal Impersonal Views in Supervised and Semi-supervised Sentiment Classification Shoushan Li Chu-Ren Huang Department of Chinese and Bilingual Studies The Hong Kong Polytechnic University churenhuang sophiaym @ Guodong Zhou Sophia Yat Mei Lee Natural Language Processing Lab School of Computer Science and Technology Soochow University China gdzhou@ Abstract In this paper we adopt two views personal and impersonal views and systematically employ them in both supervised and semi-supervised sentiment classification. Here personal views consist of those sentences which directly express speaker s feeling and preference towards a target object while impersonal views focus on statements towards a target object for evaluation. To obtain them an unsupervised mining approach is proposed. On this basis an ensemble method and a co-training algorithm are explored to employ the two views in supervised and semi-supervised sentiment classification respectively. Experimental results across eight domains demonstrate the effectiveness of our proposed approach. 1 Introduction As a special task of text classification sentiment classification aims to classify a text according to the expressed sentimental polarities of opinions such as thumb up or thumb down on the movies Pang et al. 2002 . This task has recently received considerable interests in the Natural Language Processing NLP community due to its wide applications. In general the objective of sentiment classification can be represented as a kind of binary relation R defined as an ordered triple X Y G where Xis an object set including different kinds of people . writers reviewers or users Y is another object set including the target objects . products events or even some people and G is a subset of the Cartesian product X X Y . The concerned relation in sentiment classification is X s evaluation on Y such as thumb up thumb down favorable and unfavorable . Such relation is usually .

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