Quartic Regularity

Yurii Nesterov
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Yurii Nesterov: Université catholique de Louvain, LIDAM/CORE, Belgium

No 2022001, LIDAM Discussion Papers CORE from Université catholique de Louvain, Center for Operations Research and Econometrics (CORE)

Abstract: In this paper, we propose new linearly convergent second-order methods for minimizing convex quartic polynomials. This framework is applied for designing optimization schemes, which can solve general convex problems satisfying a new condition of quartic regularity. It assumes positive definiteness and boundedness of the fourth derivative of the objective function. For such problems, an appropriate quartic regularization of Damped Newton Method has global linear rate of convergence. We discuss several important consequences of this result. In particular, it can be used for constructing new second-order methods in the framework of high-order proximal-point schemes [20, 21]. These methods have convergence rate O˜(k−p), where k is the iteration counter, p is equal to 3, 4, or 5, and tilde indicates the presence of logarithmic factors in the complexity bounds for the auxiliary problems, which are solved at each iteration of the schemes.

Keywords: Composite convex minimization; second-order methods; global complexity bounds; high-order proximal-point methods (search for similar items in EconPapers)
Pages: 24
Date: 2022-01-13
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