We propose an unsupervised model to extract two types of summaries (positive, and negative) per document based on sentiment polarity. Our model builds a weighted polar digraph from the text, then evolves recursively u...
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ISBN:
(纸本)9783319181172;9783319181165
We propose an unsupervised model to extract two types of summaries (positive, and negative) per document based on sentiment polarity. Our model builds a weighted polar digraph from the text, then evolves recursively until some desired properties converge. It can be seen as an enhanced variant of textRank type algorithms working with non-polar textgraphs. Each positive, negative, and objective opinion has some impact on the other if they are semantically related or placed close in the document. Our experiments cover several interesting scenarios. In case of a one author news article, we notice a significant overlap between the anti-summary (focusing on negatively polarized sentences) and the the summary. For a transcript of a debate or a talk-show, an anti-summary represents the disagreement of the participants on stated topic(s) whereas the summary becomes the collection of positive feedbacks. In this case, the anti-summary tends to be disjoint from the regular summary. Overall, our experiments show that our model can be used with textRank to enhance the quality of the extractive summarization process.
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