tailieunhanh - Báo cáo khoa học: "A Computational Approach to Zero-pronouns in Spanish"

In this paper, a computational approach for resolving zero-pronouns in Spanish texts is proposed. Our approach has been evaluated with partial parsing of the text and the results obtained show that these pronouns can be resolved using similar techniques that those used for pronominal anaphora. Compared to other well-known baselines on pronominal anaphora resolution, the results obtained with our approach have been consistently better than the rest. | A Computational Approach to Zero-pronouns in Spanish Antonio Ferrandez and Jesus Peral Dept. Languages and Information Systems University of Alicante Carretera San Vicente S N 03080 ALICANTE Spain antonio jperal @ Abstract In this paper a computational approach for resolving zero-pronouns in Spanish texts is proposed. Our approach has been evaluated with partial parsing of the text and the results obtained show that these pronouns can be resolved using similar techniques that those used for pronominal anaphora. Compared to other well-known baselines on pronominal anaphora resolution the results obtained with our approach have been consistently better than the rest. Introduction In this paper we focus specifically on the resolution of a linguistic problem for Spanish texts from the computational point of view zero-pronouns in the subject grammatical position. Therefore the aim of this paper is not to present a new theory regarding zeropronouns but to show that other algorithms which have been previously applied to the computational resolution of other kinds of pronoun can also be applied to resolve zeropronouns. The resolution of these pronouns is implemented in the computational system called Slot Unification Parser for Anaphora resolution SUPAR . This system which was presented in Ferrandez et al. 1999 resolves anaphora in both English and Spanish texts. It is a modular system and currently it is being used for Machine Translation and Question Answering in which this kind of pronoun is very important to solve due to its high frequency in Spanish texts as this paper will show. We are focussing on zero-pronouns in Spanish texts although they also appear in other languages such as Japanese Italian and Chinese. In English texts this sort of pronoun occurs far less frequently as the use of subject pronouns is generally compulsory in the language. While in other languages zeropronouns may appear in either the subject s or the object s grammatical position .