tailieunhanh - Báo cáo khoa học: "A probabilistic generative model for an intermediate constituency-dependency representation"

We present a probabilistic model extension to the Tesni` re Dependency Structure e (TDS) framework formulated in (Sangati and Mazza, 2009). This representation incorporates aspects from both constituency and dependency theory. In addition, it makes use of junction structures to handle coordination constructions. We test our model on parsing the English Penn WSJ treebank using a re-ranking framework. | A probabilistic generative model for an intermediate constituency-dependency representation Federico Sangati Institute for Logic Language and Computation University of Amsterdam the Netherlands Abstract We present a probabilistic model extension to the Tesniere Dependency Structure TDS framework formulated in Sangati and Mazza 2009 . This representation incorporates aspects from both constituency and dependency theory. In addition it makes use of junction structures to handle coordination constructions. We test our model on parsing the English Penn WSJ treebank using a re-ranking framework. This technique allows us to efficiently test our model without needing a specialized parser and to use the standard evaluation metric on the original Phrase Structure version of the treebank. We obtain encouraging results we achieve a small improvement over state-of-the-art results when re-ranking a small number of candidate structures on all the evaluation metrics except for chunking. 1 Introduction Since its origin computational linguistics has been dominated by Constituency Phrase Structure PS representation of sentence structure. However recently we observe a steady increase in popularity of Dependency Structure DS formalisms. Several researchers have compared the two alternatives in terms of linguistic adequacy Nivre 2005 Schneider 2008 practical applications Ding and Palmer 2005 and evaluations Lin 1995 . Dependency theory is historically accredited to Lucien Tesniere 1959 although the relation of dependency between words was only one of the various key elements proposed to represent sentence structures. In fact the original formulation incorporates the notion of chunk as well as a special type of structure to represent coordination. The Tesniere Dependency Structure TDS representation we propose in Sangati and Mazza 2009 is an attempt to formalize the original work of Tesniere with the intention to develop a simple but consistent representation which .

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