A bootstrapping algorithm for learning the polarity of words

Authors:
António Paulo Santos;Hugo Gonçalo Oliveira;Carlos Ramos;Nuno C. Marques
Affiliations:
GECAD, Institute of Engineering, Polytechnic of Porto, Portugal;CISUC, University of Coimbra, Coimbra, Portugal;GECAD, Institute of Engineering, Polytechnic of Porto, Portugal;DI-FCT, Universidade Nova de Lisboa, Monte da Caparica, Portugal
Venue:
PROPOR'12 Proceedings of the 10th international conference on Computational Processing of the Portuguese Language
Year:
2012

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Abstract

Polarity lexicons are lists of words (or meanings) where each entry is labelled as positive, negative or neutral. These lists are not available for different languages and specific domains. This work proposes and evaluates a new algorithm to classify words as positive, negative or neutral, relying on a small seed set of words, a common dictionary and a propagation algorithm. We evaluate the positive and negative polarity propagation of words, as well as the neutral polarity. The propagation is evaluated with different settings and lexical resources.