Abstract

Information-maximization clustering learns a probabilistic classi?er in an unsupervised manner so that mutual information between feature vectors and cluster assignments is maximized. A notable advantage of this approach is that it only involves continuous optimization of model parameters, which is substantially easier to solve than discrete optimization of cluster assignments. However, existing methods still involve nonconvex optimization problems, and therefore ?nding a good local optimal solution is not straightforward in practice. In this paper, we propose an alternative informationmaximization clustering method based on a squared-loss variant of mutual information. This novel approach gives a clustering solution analytically in a computationally ef?cient way via kernel eigenvalue decomposition. Furthermore, we provide a practical model selection procedure that allows us to objectively optimize tuning parameters included in the kernel function. Through experiments, we demonstrate the usefulness of the proposed approach.