Convex Calibrated Surrogates for Low-Rank Loss Matrices with Applications to Subset Ranking Losses

author: Harish G. Ramaswamy, Indian Institute of Science Bangalore
published: Nov. 7, 2014,   recorded: January 2014,   views: 1620


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The design of convex, calibrated surrogate losses, whose minimization entails consistency with respect to a desired target loss, is an important concept to have emerged in the theory of machine learning in recent years. We give an explicit construction of a convex least-squares type surrogate loss that can be designed to be calibrated for any multiclass learning problem for which the target loss matrix has a low-rank structure; the surrogate loss operates on a surrogate target space of dimension at most the rank of the target loss. We use this result to design convex calibrated surrogates for a variety of subset ranking problems, with target losses including the precision@q, expected rank utility, mean average precision, and pairwise disagreement.

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