Poster
Supervised Hierarchical Clustering with Exponential Linkage
Nishant Yadav · Ari Kobren · Nicholas Monath · Andrew McCallum

Thu Jun 13th 06:30 -- 09:00 PM @ Pacific Ballroom #196

In supervised clustering, standard techniques for learning a pairwise dissimilarity function often suffer from a discrepancy between the training and clustering objectives, leading to poor cluster quality. Rectifying this discrepancy necessitates matching the procedure for training the dissimilarity function to the clustering algorithm. In this paper, we introduce a method for training the dissimilarity function in a way that is tightly coupled with hierarchical clustering, in particular single linkage. However, the appropriate clustering algorithm for a given dataset is often unknown. Thus we introduce an approach to supervised hierarchical clustering that smoothly interpolates between single, average, and complete linkage, and we give a training procedure that simultaneously learns a linkage function and a dissimilarity function. We accomplish this with a novel Exponential Linkage function that has a learnable parameter that controls the interpolation. In experiments on four datasets, our joint training procedure consistently matches or outperforms the next best training procedure/linkage function pair and gives up to 8 points improvement in dendrogram purity over discrepant pairs.

Author Information

Nishant Yadav (University of Massachusetts Amherst)
Ari Kobren (University of Massachusetts Amherst)
Nicholas Monath (University of Massachusetts Amherst)
Andrew McCallum (UMass Amherst)

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