Publications

Publications by João Gama

1998

Dynamic discretization of continuous attributes

Authors
Gama, J; Torgo, L; Soares, C;

Publication
PROGRESS IN ARTIFICIAL INTELLIGENCE-IBERAMIA 98

Abstract
Discretization of continuous attributes is an important task for certain types of machine learning algorithms. Bayesian approaches, for instance, require assumptions about data distributions. Decision Trees on the other hand, require sorting operations to deal with continuous attributes, which largely increase learning times. This paper presents a new method of discretization, whose main characteristic is that it takes into account interdependencies between attributes. Detecting interdependencies can be seen as discovering redundant attributes. This means that our method performs attribute selection as a side effect of the discretization. Empirical evaluation on five benchmark datasets from UCI repository, using C4.5 and a naive Bayes, shows a consistent reduction of the features without loss of generalization accuracy.

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2005

Knowledge Discovery in Databases: PKDD 2005, 9th European Conference on Principles and Practice of Knowledge Discovery in Databases, Porto, Portugal, October 3-7, 2005, Proceedings

Authors
Jorge, A; Torgo, L; Brazdil, P; Camacho, R; Gama, J;

Publication
PKDD

Abstract

2005

Machine Learning: ECML 2005, 16th European Conference on Machine Learning, Porto, Portugal, October 3-7, 2005, Proceedings

Authors
Gama, J; Camacho, R; Brazdil, P; Jorge, A; Torgo, L;

Publication
ECML

Abstract

2009

Discovery Science, 12th International Conference, DS 2009, Porto, Portugal, October 3-5, 2009

Authors
Gama, J; Costa, VS; Jorge, AM; Brazdil, P;

Publication
Discovery Science

Abstract

2009

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Authors
Gama, J; Costa, VS; Jorge, A; Brazdil, P;

Publication
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract

2005

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Authors
Jorge, A; Torgo, L; Brazdil, P; Camacho, R; Gama, J;

Publication
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abstract