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

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1 Author(s)
Ikeda, K. ; Graduate Sch. of Informatics, Kyoto Univ., Japan

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.

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Neural Networks, IEEE Transactions on  (Volume:17 ,  Issue: 1 )