Papers › Multi-class Graph Clustering via Approximated Effective p-Resistance
Multi-class Graph Clustering via Approximated Effective p-Resistance
Shota Saito, Mark Herbster
This paper develops an approximation to the (effective) p-resistance and applies it to multi-class clustering. Spectral methods based on the graph Laplacian and its generalization to the graph p-Laplacian have been a backbone of non-euclidean clustering techniques. The advantage of the p-Laplacian is that the parameter p induces a controllable bias on cluster structure. The drawback of p-Laplacian eigenvector based methods is that the third and higher eigenvectors are difficult to compute. Thus, instead, we are motivated to use the p-resistance induced by the p-Laplacian for clustering. For p-resistance, small p biases towards clusters with high internal connectivity while large p biases towards clusters of small "extent," that is a preference for smaller shortest-path distances between vertices in the cluster. However, the p-resistance is expensive to compute. We overcome this by developing an approximation to the p-resistance. We prove upper and lower bounds on this approximation and observe that it is exact when the graph is a tree. We also provide theoretical justification for the use of p-resistance for clustering. Finally, we provide experiments comparing our approximated p-resistance clustering to other p-Laplacian based methods.
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