|Dominik Mautz||Ludwig Maximilian University of Munich)|
|Wei Ye||Ludwig Maximilian University of Munich|
|Claudia Plant||University of Vienna|
This paper studies non-redundant clustering. The authors show that non-redundant k-means-like clusterings may exist in different, arbitrarily oriented subspaces of the high-dimensional space.
A huge object collection in high-dimensional space can often be clustered in more than one way, for instance, objects could be clustered by their shape or alternatively by their color. Each grouping represents a different view of the data set. The new research field of non-redundant clustering addresses this class of problems. In this paper, we follow the approach that different, non-redundant k-means-like clusterings may exist in different, arbitrarily oriented subspaces of the high-dimensional space. We assume that these subspaces (and optionally a further noise space without any cluster structure) are orthogonal to each other. This assumption enables a particularly rigorous mathematical treatment of the non-redundant clustering problem and thus a particularly efficient algorithm, which we call Nr-Kmeans (for non-redundant k-means). The superiority of our algorithm is demonstrated both theoretically, as well as in extensive experiments.