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Journal Articles Problems of Information Transmission Year : 2005

Recursive Aggregation of Estimators by the Mirror Descent Algorithm with Averaging

Abstract

We consider a recursive algorithm to construct an aggregated estimator from a finite number of base decision rules in the classification problem. The estimator approximately minimizes a convex risk functional under the l1-constraint. It is defined by a stochastic version of the mirror descent algorithm (i.e., of the method which performs gradient descent in the dual space) with an additional averaging. The main result of the paper is an upper bound for the expected accuracy of the proposed estimator. This bound is of the order $\sqrt{(\log M)/t}$ with an explicit and small constant factor, where $M$ is the dimension of the problem and $t$ stands for the sample size. A similar bound is proved for a more general setting that covers, in particular, the regression model with squared loss.
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Dates and versions

hal-00004908 , version 1 (16-05-2005)
hal-00004908 , version 2 (07-03-2006)

Identifiers

Cite

Anatoli B. Juditsky, Alexander Nazin, Alexandre Tsybakov, Nicolas Vayatis. Recursive Aggregation of Estimators by the Mirror Descent Algorithm with Averaging. Problems of Information Transmission, 2005, 41 (4), pp.368-384. ⟨10.1007/s11122-006-0005-2⟩. ⟨hal-00004908v2⟩
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