Enlarging the Margins in Perceptron Decision Trees
Wu, D., Bennett, K.P., Cristianini, N. and Shawe-Taylor, J. (2000) Enlarging the Margins in Perceptron Decision Trees. Machine Learning, 41, (3), 295-313.
Capacity control in perceptron decision trees is typically performed by controlling their size. We prove that other quantities can be as relevant to reduce their flexibility and combat overfitting. In particular, we provide an upper bound on the generalization error which depends both on the size of the tree and on the margin of the decision nodes. So enlarging the margin in perceptron decision trees will reduce the upper bound on generalization error. Based on this analysis, we introduce three new algorithms, which can induce large margin perceptron decision trees. To assess the effect of the large margin bias, OC1 (Journal of Artificial Intelligence Research, 1994, 2, 1–32.) of Murthy, Kasif and Salzberg, a well-known system for inducing perceptron decision trees, is used as the baseline algorithm. An extensive experimental study on real world data showed that all three new algorithms perform better or at least not significantly worse than OC1 on almost every dataset with only one exception. OC1 performed worse than the best margin-based method on every dataset.
|Keywords:||capacity control, decision trees, perceptron, learning theory, learning algorithm|
|Divisions:||Faculty of Physical and Applied Science > Electronics and Computer Science
|Date Deposited:||02 Mar 2005|
|Last Modified:||14 Aug 2012 01:45|
|Contributors:||Wu, D. (Author)
Bennett, K.P. (Author)
Cristianini, N. (Author)
Shawe-Taylor, J. (Author)
|Publisher:||Kluwer Academic Publishers|
|Further Information:||Google Scholar|
|ISI Citation Count:||34|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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