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Pattern-based unsupervised parsing method

Published online by Cambridge University Press:  04 June 2014

JESÚS SANTAMARÍA
Affiliation:
Lenguajes y Sistemas Informáticos, Universidad Nacional de Educación a Distancia (UNED), Madrid 28040, Spain email: jsant@lsi.uned.es, lurdes@lsi.uned.es
LOURDES ARAUJO
Affiliation:
Lenguajes y Sistemas Informáticos, Universidad Nacional de Educación a Distancia (UNED), Madrid 28040, Spain email: jsant@lsi.uned.es, lurdes@lsi.uned.es

Abstract

We have developed a heuristic method for unsupervised parsing of unrestricted text. Our method relies on detecting certain patterns of part-of-speech tag sequences of words in sentences. This detection is based on statistical data obtained from the corpus and allows us to classify part-of-speech tags into classes that play specific roles in the parse trees. These classes are then used to construct the parse tree of new sentences via a set of deterministic rules. Aiming to asses the viability of the method on different languages, we have tested it on English, Spanish, Italian, Hebrew, German, and Chinese. We have obtained a significant improvement over other unsupervised approaches for some languages, including English, and provided, as far as we know, the first results of this kind for others.

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Articles
Copyright
Copyright © Cambridge University Press 2014 

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