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DCA based algorithms for feature selection in multi-class support vector machine. (English) Zbl 1404.68111
Summary: This paper addresses the problem of feature selection for Multi-class Support Vector Machines. Two models involving the \(\ell_0\) (the zero norm) and the \(\ell_2\)-\(\ell_0\) regularizations are considered for which two continuous approaches based on DC (Difference of Convex functions) programming and DCA (DC Algorithms) are investigated. The first is DC approximation via several sparse inducing functions and the second is an exact reformulation approach using penalty techniques. Twelve versions of DCA based algorithms are developed on which empirical computational experiments are fully performed. Numerical results on real-world datasets show the efficiency and the superiority of our methods versus one of the best standard algorithms on both feature selection and classification.

68T05 Learning and adaptive systems in artificial intelligence
90C26 Nonconvex programming, global optimization
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