The huge amount of textual data on the Web has grown in the last few years rapidly creating unique contents of massive dimension. In a decision making context, one of the most relevant tasks is polarity classification of a text source, which is usually performed through supervised learning methods. Most of the existing approaches select the best classification model leading to over-confident decisions that do not take into account the inherent uncertainty of the natural language. In this paper, we pursue the paradigm of ensemble learning to reduce the noise sensitivity related to language ambiguity and therefore to provide a more accurate prediction of polarity. The proposed ensemble method is based on Bayesian Model Averaging, where both uncertainty and reliability of each single model are taken into account. We address the classifier selection problem by proposing a greedy approach that evaluates the contribution of each model with respect to the ensemble. Experimental results on gold standard datasets show that the proposed approach outperforms both traditional classification and ensemble methods.

Fersini, E., Messina, V., Pozzi, F. (2014). Sentiment analysis: Bayesian Ensemble Learning. DECISION SUPPORT SYSTEMS, 68, 26-38 [10.1016/j.dss.2014.10.004].

Sentiment analysis: Bayesian Ensemble Learning

FERSINI, ELISABETTA
;
MESSINA, VINCENZINA
Secondo
;
POZZI, FEDERICO ALBERTO
Ultimo
2014

Abstract

The huge amount of textual data on the Web has grown in the last few years rapidly creating unique contents of massive dimension. In a decision making context, one of the most relevant tasks is polarity classification of a text source, which is usually performed through supervised learning methods. Most of the existing approaches select the best classification model leading to over-confident decisions that do not take into account the inherent uncertainty of the natural language. In this paper, we pursue the paradigm of ensemble learning to reduce the noise sensitivity related to language ambiguity and therefore to provide a more accurate prediction of polarity. The proposed ensemble method is based on Bayesian Model Averaging, where both uncertainty and reliability of each single model are taken into account. We address the classifier selection problem by proposing a greedy approach that evaluates the contribution of each model with respect to the ensemble. Experimental results on gold standard datasets show that the proposed approach outperforms both traditional classification and ensemble methods.
Articolo in rivista - Articolo scientifico
Ensemble learning; Polarity classification; Sentiment analysis; Management Information Systems; Information Systems; Information Systems and Management; Arts and Humanities (miscellaneous); Developmental and Educational Psychology
English
2014
68
26
38
none
Fersini, E., Messina, V., Pozzi, F. (2014). Sentiment analysis: Bayesian Ensemble Learning. DECISION SUPPORT SYSTEMS, 68, 26-38 [10.1016/j.dss.2014.10.004].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/59547
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