Effects of kernel function on Nu support vector machines in extreme cases

Authors:
K. Ikeda
Affiliations:
Graduate Sch. of Informatics, Kyoto Univ., Japan
Venue:
IEEE Transactions on Neural Networks
Year:
2006

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Abstract

How we should choose a kernel function in support vector machines (SVMs), is an important but difficult problem. In this paper, we discuss the properties of the solution of the ν-SVM's, a variation of SVM's, for normalized feature vectors in two extreme cases: All feature vectors are almost orthogonal and all feature vectors are almost the same. In the former case, the solution of the ν-SVM is nearly the center of gravity of the examples given while the solution is approximated to that of the ν-SVM with the linear kernel in the latter case. Although extreme kernels are not employed in practice, analyzes are helpful to understand the effects of a kernel function on the generalization performance.