Classifier subset selection for biomedical named entity recognition

Authors:
Nazife Dimililer;Ekrem Varoğlu;Hakan Altınçay
Affiliations:
Department of Computer Engineering, Eastern Mediterranean University, Mağusa, Northern Cyprus;Department of Computer Engineering, Eastern Mediterranean University, Mağusa, Northern Cyprus;Department of Computer Engineering, Eastern Mediterranean University, Mağusa, Northern Cyprus
Venue:
Applied Intelligence
Year:
2009

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Abstract

Classifier ensembling approach is considered for biomedical named entity recognition task. A vote-based classifier selection scheme having an intermediate level of search complexity between static classifier selection and real-valued and class-dependent weighting approaches is developed. Assuming that the reliability of the predictions of each classifier differs among classes, the proposed approach is based on selection of the classifiers by taking into account their individual votes. A wide set of classifiers, each based on a different set of features and modeling parameter setting are generated for this purpose. A genetic algorithm is developed so as to label the predictions of these classifiers as reliable or not. During testing, the votes that are labeled as being reliable are combined using weighted majority voting. The classifier ensemble formed by the proposed scheme surpasses the full object F-score of the best individual classifier by 2.75% and it is the highest score achieved on the data set considered.