Genetic interval neural networks for granular data regression

Authors:
Mario G. C. A. Cimino;Beatrice Lazzerini;Francesco Marcelloni;Witold Pedrycz
Affiliations:
Dipartimento di Ingegneria dell'Informazione, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy;Dipartimento di Ingegneria dell'Informazione, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy;Dipartimento di Ingegneria dell'Informazione, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy;Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7 and Systems Research Institute, Polish Academy of Sciences, Warsaw, Poland
Venue:
Information Sciences: an International Journal
Year:
2014

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Abstract

Granular data and granular models offer an interesting tool for representing data in problems involving uncertainty, inaccuracy, variability and subjectivity have to be taken into account. In this paper, we deal with a particular type of information granules, namely interval-valued data. We propose a multilayer perceptron (MLP) to model interval-valued input-output mappings. The proposed MLP comes with interval-valued weights and biases, and is trained using a genetic algorithm designed to fit data with different levels of granularity. In the evolutionary optimization, two implementations of the objective function, based on a numeric-valued and an interval-valued network error, respectively, are discussed and compared. The modeling capabilities of the proposed MLP are illustrated by means of its application to both synthetic and real world datasets.