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A Shortest-path Method for Arc-factored Semantic Role Labeling

Xavier Lluis, Xavier Carreras, Lluis Marquez
We introduce a Semantic Role Labeling (SRL) parser that finds semantic roles for a predicate together with the syntactic paths linking predicates and arguments. Our main contribution is to formulate SRL in terms of shortest-path inference, on the assumption that the SRL model is restricted to arc-factored features of the syntactic paths behind semantic roles. Overall, our method for SRL is a novel way to exploit larger variability in the syntactic realizations of predicate-argument relations, moving away from pipeline architectures. Experiments show that our approach improves the robustness of the predictions, producing arc-factored models that perform closely to methods using unrestricted features from the syntax.
Conference on Empirical Methods in Natural Language Processing (EMNLP 2014), October 25–29, Doha, Qatar. Full paper available on EMNLP Website


2014-066.pdf (193.43 kB)