Title:
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Structured prediction models via the matrix-tree theorem
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Author:
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Koo, Terry; Globerson, Amir; Carreras Pérez, Xavier; Collins, Michael
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Other authors:
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Universitat Politècnica de Catalunya. GPLN - Grup de Processament del Llenguatge Natural |
Abstract:
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This paper provides an algorithmic framework for learning statistical models involving directed spanning trees, or equivalently non-projective dependency structures. We show how partition functions and marginals for directed spanning trees can be computed by an adaptation of Kirchhoff’s Matrix-Tree Theorem. To demonstrate an application of the method, we perform experiments which use the algorithm in training both log-linear and max-margin dependency parsers. The new training methods give improvements in accuracy over perceptron-trained models. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Intel·ligència artificial::Llenguatge natural -Computational linguistics -Lingüística computacional |
Rights:
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Document type:
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Article - Submitted version Conference Object |
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