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Local Correlation Clustering with Asymmetric Classification Errors

Jafar Jafarov · Sanchit Kalhan · Konstantin Makarychev · Yury Makarychev

Abstract: In the Correlation Clustering problem, we are given a complete weighted graph G with its edges labeled as similar" and dissimilar" by a noisy binary classifier. For a clustering C of graph G, a similar edge is in disagreement with C, if its endpoints belong to distinct clusters; and a dissimilar edge is in disagreement with C if its endpoints belong to the same cluster. The disagreements vector, \disagree, is a vector indexed by the vertices of G such that the v-th coordinate \disagreev equals the weight of all disagreeing edges incident on v. The goal is to produce a clustering that minimizes the p norm of the disagreements vector for p1. We study the p objective in Correlation Clustering under the following assumption: Every similar edge has weight in [αw,w] and every dissimilar edge has weight at least αw (where α1 and w>0 is a scaling parameter). We give an O((\nicefrac1α)\nicefrac12\nicefrac12plog\nicefrac1α) approximation algorithm for this problem. Furthermore, we show an almost matching convex programming integrality gap.

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