tailieunhanh - Báo cáo khoa học: "A Structured Model for Joint Learning of Argument Roles and Predicate Senses"

In predicate-argument structure analysis, it is important to capture non-local dependencies among arguments and interdependencies between the sense of a predicate and the semantic roles of its arguments. However, no existing approach explicitly handles both non-local dependencies and semantic dependencies between predicates and arguments. In this paper we propose a structured model that overcomes the limitation of existing approaches; the model captures both types of dependencies simultaneously by introducing four types of factors including a global factor type capturing non-local dependencies among arguments and a pairwise factor type capturing local dependencies between a predicate and an argument. . | A Structured Model for Joint Learning of Argument Roles and Predicate Senses Yotaro Watanabe Graduate School of Information Sciences Tohoku University 6-6-05 Aramaki Aza Aoba Aoba-ku Sendai 980-8579 Japan yotaro-w@ Abstract In predicate-argument structure analysis it is important to capture non-local dependencies among arguments and interdependencies between the sense of a predicate and the semantic roles of its arguments. However no existing approach explicitly handles both non-local dependencies and semantic dependencies between predicates and arguments. In this paper we propose a structured model that overcomes the limitation of existing approaches the model captures both types of dependencies simultaneously by introducing four types of factors including a global factor type capturing non-local dependencies among arguments and a pairwise factor type capturing local dependencies between a predicate and an argument. In experiments the proposed model achieved competitive results compared to the state-of-the-art systems without applying any feature selection procedure. 1 Introduction Predicate-argument structure analysis is a process of assigning who does what to whom where when etc. for each predicate. Arguments of a predicate are assigned particular semantic roles such as Agent Theme Patient etc. Lately predicate-argument structure analysis has been regarded as a task of assigning semantic roles of arguments as well as word senses of a predicate Surdeanu et al. 2008 Hajic et al. 2009 . Several researchers have paid much attention to predicate-argument structure analysis and the following two important factors have been shown. Toutanova et al. 2008 Johansson and Nugues 2008 and Bjorkelund et al. 2009 presented importance of capturing non-local dependencies Masayuki Asahara Yuji Matsumoto Graduate School of Information Science Nara Institute of Science and Technology 8916-5 Takayama Ikoma Nara 630-0192 Japan masayu-a matsu @ of core .