Abstract
We present an analysis of morpho-lexical features to learn SVM models for recognizing TimeML time and event expressions. We evaluate over the TempEval-2 data, the features: word, lemma, and PoS in isolation, in different size static-context windows, and in a syntax-motivated dynamic-context windows defined in this paper. The results show that word, lemma, and PoS introduce complementary advantages and their combination achieves the best performance; this performance is improved using context, and, with dynamic-context, timex recognition is improved to reach state-of-art performance. Although more complex approaches improve the efficacy, the morpho-lexical features can be obtained more efficiently and show a reasonable efficacy.
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References
Kolomiyets, O., Moens, M.-F.: Kul: Recognition and normalization of temporal expressions. In: Proceedings of SemEval-5, pp. 325–328. ACL (2010)
Llorens, H., Saquete, E., Navarro-Colorado, B.: TIPSem (English and Spanish): Evaluating CRFs and Semantic Roles in TempEval-2. In: Proceedings of SemEval-5, pp. 284–291. ACL (2010)
Pustejovsky, J., Castaño, J.M., Ingria, R., SaurÃ, R., Gaizauskas, R., Setzer, A., Katz, G.: TimeML: Robust Specification of Event and Temporal Expressions in Text. In: IWCS-5 (2003)
UzZaman, N., Allen, J.F.: Trips and trios system for tempeval-2: Extracting temporal information from text. In: Proceedings of SemEval-5, pp. 276–283. ACL (2010)
Verhagen, M., SaurÃ, R., Caselli, T., Pustejovsky, J.: Semeval-2010 task 13: Tempeval-2. In: Proceedings of the 5th International Workshop on Semantic Evaluation, pp. 57–62. ACL, Uppsala (2010)
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Llorens, H., Saquete, E., Navarro, B. (2011). Syntax-Motivated Context Windows of Morpho-Lexical Features for Recognizing Time and Event Expressions in Natural Language. In: Muñoz, R., Montoyo, A., Métais, E. (eds) Natural Language Processing and Information Systems. NLDB 2011. Lecture Notes in Computer Science, vol 6716. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22327-3_42
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DOI: https://doi.org/10.1007/978-3-642-22327-3_42
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