Towards the lemmatisation of polish nominal syntactic groups using a shallow grammar

Authors:
Łukasz Degórski
Affiliations:
Institute of Computer Science, Polish Academy of Sciences, Warszawa, Poland
Venue:
SIIS'11 Proceedings of the 2011 international conference on Security and Intelligent Information Systems
Year:
2011

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Abstract

While morphological analysers and taggers usually assign lemmata to wordforms, those tools focus on single words. For some tasks a tool that lemmatises (and thus normalises) whole phrases would be more appropriate. The paper presents, discusses and evaluates a set of tools to lemmatise nominal groups, based on a shallow grammar for Polish. The tools reach an overall success rate of over 58%, and almost 83% on the nominal groups that are correctly recognised by the grammar. The approach should be portable to other languages, especially those morphologically rich.