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2018 On kernel methods for covariates that are rankings
Horia Mania, Aaditya Ramdas, Martin J. Wainwright, Michael I. Jordan, Benjamin Recht
Electron. J. Statist. 12(2): 2537-2577 (2018). DOI: 10.1214/18-EJS1437


Permutation-valued features arise in a variety of applications, either in a direct way when preferences are elicited over a collection of items, or an indirect way when numerical ratings are converted to a ranking. To date, there has been relatively limited study of regression, classification, and testing problems based on permutation-valued features, as opposed to permutation-valued responses. This paper studies the use of reproducing kernel Hilbert space methods for learning from permutation-valued features. These methods embed the rankings into an implicitly defined function space, and allow for efficient estimation of regression and test functions in this richer space. We characterize both the feature spaces and spectral properties associated with two kernels for rankings, the Kendall and Mallows kernels. Using tools from representation theory, we explain the limited expressive power of the Kendall kernel by characterizing its degenerate spectrum, and in sharp contrast, we prove that the Mallows kernel is universal and characteristic. We also introduce families of polynomial kernels that interpolate between the Kendall (degree one) and Mallows (infinite degree) kernels. We show the practical effectiveness of our methods via applications to Eurobarometer survey data as well as a Movielens ratings dataset.


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Horia Mania. Aaditya Ramdas. Martin J. Wainwright. Michael I. Jordan. Benjamin Recht. "On kernel methods for covariates that are rankings." Electron. J. Statist. 12 (2) 2537 - 2577, 2018.


Received: 1 September 2017; Published: 2018
First available in Project Euclid: 14 August 2018

zbMATH: 06917485
MathSciNet: MR3843387
Digital Object Identifier: 10.1214/18-EJS1437


Vol.12 • No. 2 • 2018
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