Using Key Sentence to Improve Sentiment Classification

摘要

When predicting the polarity of a review, not all sentences are equally informative. In this paper, we divide a document into key sentence and trivial sentences. The key sentence expresses the author's overall view while trivial sentences describe the details. To take full advantage of the differences and complementarity between the two kinds of sentences, we incorporate them in supervised and semi-supervised learning respectively. In supervised sentiment classification, a classifier combination approach is adopted; in semi supervised sentiment classification, a co-training algorithm is proposed. Experiments carried out on eight domains show that our approach performs better than the baseline method and the key sentence extraction is effective.