Re-thinking Supertags in Linear Context-free Rewriting Systems for Constituency ParsingDownload PDF


08 Mar 2022 (modified: 05 May 2023)NAACL 2022 Conference Blind SubmissionReaders: Everyone
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Paper Type: Short paper (up to four pages of content + unlimited references and appendices)
Abstract: Recently, a supertagging-based approach for parsing discontinuous constituent trees with linear context-free rewriting systems (LCFRS) was introduced. We reformulate their algorithm for the extraction of supertags from treebanks to be more concise. Moreover, we add some extensions that give us control over the extraction process in terms of supertag granularity and which terminal symbols are associated with supertags. Our additions lead to an increase in parsing quality with LCFRS supertagging in all three compared treebanks. The scores are among the state of the art in discontinuous constituent parsing.
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