Characterization of the equivalence of robustification and regularization in linear and matrix regression

•We characterize the connection between robust optimization and regularization.•We extend the characterization to new settings such as matrix completion.•Robust optimization and regularization are not always equivalent. The notion of developing statistical methods in machine learning which are robus...

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Bibliographic Details
Published in:European journal of operational research Vol. 270; no. 3; pp. 931 - 942
Main Authors: Bertsimas, Dimitris, Copenhaver, Martin S.
Format: Journal Article
Language:English
Published: Elsevier B.V 01.11.2018
Subjects:
Adversarial learning
Convex programming
Penalty methods
Robust optimization
Statistical regression
Statistical regression
Penalty methods
Robust optimization
Adversarial learning
Convex programming
ISSN:0377-2217, 1872-6860
Online Access:Get full text
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Summary:•We characterize the connection between robust optimization and regularization.•We extend the characterization to new settings such as matrix completion.•Robust optimization and regularization are not always equivalent. The notion of developing statistical methods in machine learning which are robust to adversarial perturbations in the underlying data has been the subject of increasing interest in recent years. A common feature of this work is that the adversarial robustification often corresponds exactly to regularization methods which appear as a loss function plus a penalty. In this paper we deepen and extend the understanding of the connection between robustification and regularization (as achieved by penalization) in regression problems. Specifically,(a)In the context of linear regression, we characterize precisely under which conditions on the model of uncertainty used and on the loss function penalties robustification and regularization are equivalent.(b)We extend the characterization of robustification and regularization to matrix regression problems (matrix completion and Principal Component Analysis).
ISSN:0377-2217
1872-6860
DOI:10.1016/j.ejor.2017.03.051