Hierarchical and Reweighting Cluster Kernels for Semi-Supervised Learning


  • Zalí¡n Bodó Department of Mathematics and Computer Science Babes-Bolyai University Kogalniceanu 1, 400084 Cluj-Napoca, Romania
  • Lehel Csató Department of Mathematics and Computer Science Babes-Bolyai University Kogalniceanu 1, 400084 Cluj-Napoca, Romania


Kernel methods, semi-supervised learning, clustering


Recently semi-supervised methods gained increasing attention and many novel semi-supervised learning algorithms have been proposed. These methods exploit the information contained in the usually large unlabeled data set in order to improve classification or generalization performance. Using data-dependent kernels for kernel machines one can build semi-supervised classifiers by building the kernel in such a way that feature space dot products incorporate the structure of the data set. In this paper we propose two such methods: one using specific hierarchical clustering, and another kernel for reweighting an arbitrary base kernel taking into account the cluster structure of the data.


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