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Joint A* Syntactic and Semantic Parsing for CCG

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Joint models of syntactic and semantic parsing have the potential to improve performance on both tasks—but to date, the best results have been achieved with pipelines. I will introduce a new joint model using CCG , which is motivated by the close link between CCG syntax and semantics. Semantic roles are recovered by labelling the deep dependency structures produced by the grammar. Furthermore, I will show how to exploit CCG ’s strong lexicalization to introduce a new A∗ parsing algorithm—-which finds optimal parses over 5 times faster than CKY parsing. Our joint model is the first to substantially improve both syntactic and semantic accuracy over a comparable pipeline, and also achieves state-of-the-art results for a non-ensemble semantic role labelling model.

This talk is part of the NLIP Seminar Series series.

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