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Fast, Provable Algorithms for Isotonic Regression in all ell_(p)-norms

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arxiv 1507.00710 v2 pith:YXNNPJAD submitted 2015-07-02 cs.LG cs.DSmath.STstat.TH

Fast, Provable Algorithms for Isotonic Regression in all ell_(p)-norms

classification cs.LG cs.DSmath.STstat.TH
keywords algorithmsisotonicregressionfastnormsacycliccomputingdescribed
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Given a directed acyclic graph $G,$ and a set of values $y$ on the vertices, the Isotonic Regression of $y$ is a vector $x$ that respects the partial order described by $G,$ and minimizes $||x-y||,$ for a specified norm. This paper gives improved algorithms for computing the Isotonic Regression for all weighted $\ell_{p}$-norms with rigorous performance guarantees. Our algorithms are quite practical, and their variants can be implemented to run fast in practice.

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