Séminaires RALI-OLST

Combining Linguistic Features with Weighted Bayesian Classifier for Temporal Reference Processing

Guihong Cao

RALI, DIRO

Le mercredi 20 octobre 2004 à 11 h 30

Salle 3195, Pavillon André-Aisenstadt


We will present a computational model for determining temporal relations in Chinese. The model takes into account the effects of linguistic features, such as tense/aspect, temporal connectives, and discourse structures, and makes use of the fact that events are represented in different temporal structures. A machine learning approach, Weighted Bayesian Classifier, is developed to map their combined effects to the corresponding relations. An empirical study is conducted to investigate different combination methods, including lexical-based, grammatical-based, and role-based methods. When used in combination, the weights of the features may not be equal. Incorporating with an optimization algorithm, the weights are fine tuned and the improvement is remarkable.



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