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Discriminative Strategies to Integrate Multiword Expression Recognition and Parsing

Abstract : The integration of multiword expressions in a parsing procedure has been shown to improve accuracy in an artificial context where such expressions have been perfectly pre-identified. This paper evaluates two empirical strategies to integrate multiword units in a real constituency parsing context and shows that the results are not as promising as has sometimes been suggested. Firstly, we show that pre-grouping multiword expressions before parsing with a state-of-the-art recognizer improves multiword recognition accuracy and unlabeled attachment score. However, it has no statistically significant impact in terms of F-score as incorrect multiword expression recognition has important side effects on parsing. Secondly, integrating multiword expressions in the parser grammar followed by a reranker specific to such expressions slightly improves all evaluation metrics.
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Submitted on : Wednesday, February 20, 2013 - 3:42:41 PM
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  • HAL Id : hal-00790613, version 1


Mathieu Constant, Anthony Sigogne, Patrick Watrin. Discriminative Strategies to Integrate Multiword Expression Recognition and Parsing. 50th Annual Meeting of the Association for Computational Linguistics (ACL'12), Jul 2012, South Korea. pp.204-212. ⟨hal-00790613⟩



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