Recognising Nested Named Entities in Biomedical Text

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Although recent named entity (NE) annotation efforts involve the markup of nested entities, there has been limited focus on recognising such nested structures. This paper introduces and compares three techniques for modelling and recognising nested entities by means of a conventional sequence tagger. The methods are tested and evaluated on two biomedical data sets that contain entity nesting. All methods yield an improvement over the baseline tagger that is only trained on flat annotation.
Original languageEnglish
Title of host publicationProceedings of BioNLP 2007
PublisherASSOC COMPUTATIONAL LINGUISTICS-ACL
Pages65-72
Number of pages8
Publication statusPublished - 2007

Keywords

  • txm, ttt2,

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