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Open AccessArticle

Ensemble Estimation of Information Divergence

1
Genetics Department and Applied Math Program, Yale University, New Haven, CT 06520, USA
2
Intuit Inc., Mountain View, CA 94043, USA
3
IBM Research, Cambridge, MA 02142, USA
4
Electrical Engineering and Computer Science Department, University of Michigan, Ann Arbor, MI 48109, USA
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in the 2016 IEEE International Symposium on Information Theory (ISIT), Barcelona, Spain, 10–15 July 2016; pp. 1133–1137.
Current address: Department of Mathematics and Statistics, Utah State University, Logan, UT 84322, USA
Entropy 2018, 20(8), 560; https://doi.org/10.3390/e20080560
Received: 29 June 2018 / Revised: 23 July 2018 / Accepted: 26 July 2018 / Published: 27 July 2018
(This article belongs to the Special Issue Information Theory in Machine Learning and Data Science)
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PDF [997 KB, uploaded 27 July 2018]
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Abstract

Recent work has focused on the problem of nonparametric estimation of information divergence functionals between two continuous random variables. Many existing approaches require either restrictive assumptions about the density support set or difficult calculations at the support set boundary which must be known a priori. The mean squared error (MSE) convergence rate of a leave-one-out kernel density plug-in divergence functional estimator for general bounded density support sets is derived where knowledge of the support boundary, and therefore, the boundary correction is not required. The theory of optimally weighted ensemble estimation is generalized to derive a divergence estimator that achieves the parametric rate when the densities are sufficiently smooth. Guidelines for the tuning parameter selection and the asymptotic distribution of this estimator are provided. Based on the theory, an empirical estimator of Rényi-α divergence is proposed that greatly outperforms the standard kernel density plug-in estimator in terms of mean squared error, especially in high dimensions. The estimator is shown to be robust to the choice of tuning parameters. We show extensive simulation results that verify the theoretical results of our paper. Finally, we apply the proposed estimator to estimate the bounds on the Bayes error rate of a cell classification problem. View Full-Text
Keywords: divergence; differential entropy; nonparametric estimation; central limit theorem; convergence rates; bayes error rate divergence; differential entropy; nonparametric estimation; central limit theorem; convergence rates; bayes error rate
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Moon, K.R.; Sricharan, K.; Greenewald, K.; Hero, A.O., III. Ensemble Estimation of Information Divergence . Entropy 2018, 20, 560.

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