TAILIEUCHUNG - Báo cáo khoa học: "Semi-Supervised Polarity Lexicon Induction"

We present an extensive study on the problem of detecting polarity of words. We consider the polarity of a word to be either positive or negative. For example, words such as good, beautiful, and wonderful are considered as positive words; whereas words such as bad, ugly, and sad are considered negative words. We treat polarity detection as a semi-supervised label propagation problem in a graph. In the graph, each node represents a word whose polarity is to be determined. Each weighted edge encodes a relation that exists between two words. Each node (word) can have two labels: positive or. | Semi-Supervised Polarity Lexicon Induction Delip Rao Department of Computer Science Johns Hopkins University Baltimore MD delip@ Deepak Ravichandran Google Inc. 1600 Amphitheatre Parkway Mountain View CA deepakr@ Abstract We present an extensive study on the problem of detecting polarity of words. We consider the polarity of a word to be either positive or negative. For example words such as good beautiful and wonderful are considered as positive words whereas words such as bad ugly and sad are considered negative words. We treat polarity detection as a semi-supervised label propagation problem in a graph. In the graph each node represents a word whose polarity is to be determined. Each weighted edge encodes a relation that exists between two words. Each node word can have two labels positive or negative. We study this framework in two different resource availability scenarios using WordNet and OpenOffice thesaurus when WordNet is not available. We report our results on three different languages English French and Hindi. Our results indicate that label propagation improves significantly over the baseline and other semisupervised learning methods like Mincuts and Randomized Mincuts for this task. 1 Introduction Opinionated texts are characterized by words or phrases that communicate positive or negative sentiment. Consider the following example of two movie reviews1 shown in Figure 1. The positive review is peppered with words such as enjoyable likeable decent breathtakingly and the negative Work done as a summer intern at Google Inc. Source Live Free or Die Hard Hugely ettjoyable action nick that deliversTlikeablel chara cters a d ecent pl ot pIenty of wisecracks and I ridiculousỊstunts than you ll know what to do with. I FULL REVIEW Comments Ẩ Matthew Turner VIEWLONDON Two hours of non-L stopjear-shatterinql humourless shrieking. It s simpty unbearable. You soon find yourself begging for him to die. f FULL REVIEW Comments J .

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