Abstract
In this paper we introduce the notions of critical and noncritical multipliers for variational systems and extend to a general framework the corresponding notions by Izmailov and Solodov developed for classical Karush–Kuhn–Tucker (KKT) systems. It has been well recognized that critical multipliers are largely responsible for slow convergence of major primal–dual algorithms of optimization. The approach of this paper allows us to cover KKT systems arising in various classes of smooth and nonsmooth problems of constrained optimization including composite optimization, minimax problems, etc. Concentrating on a polyhedral subdifferential case and employing recent results of second-order subdifferential theory, we obtain complete characterizations of critical and noncritical multipliers via the problem data. It is shown that noncriticality is equivalent to a certain calmness property of a perturbed variational system and that critical multipliers can be ruled out by full stability of local minimizers in problems of composite optimization. For the latter class we establish the equivalence between noncriticality of multipliers and robust isolated calmness of the associated solution map and then derive explicit characterizations of these notions via appropriate second-order sufficient conditions. It is finally proved that the Lipschitz-like/Aubin property of solution maps yields their robust isolated calmness.
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Bonnans, J.F.: Local analysis of Newton-type methods for variational inequalities and nonlinear programming. Appl. Math. Optim. 29, 161–186 (1994)
Bonnans, J.F., Shapiro, A.: Perturbation Analysis of Optimization Problems. Springer, New York (2000)
Chieu, N.H., Hien, L.V.: Computation of graphical derivative for a class of normal cone mappings under a very weak condition. SIAM J. Optim. 27, 190–204 (2017)
Ding, C., Sun, D., Zhang, L.: Characterization of the robust isolated calmness for a class of conic programming problems. SIAM J. Optim. 27, 67–90 (2017)
Dontchev, A.L., Rockafellar, R.T.: Characterizations of Lipschitzian stability in nonlinear programming. In: Fiacco, A.V. (ed.) Mathematical Programming with Data Perturbations, pp. 65–82. Marcel Dekker, New York (1997)
Dontchev, A.L., Rockafellar, R.T.: Implicit Functions and Solution Mappings: A View from Variational Analysis, 2nd edn. Springer, New York (2014)
Facchinei, F., Pang, J.-S.: Finite-Dimesional Variational Inequalities and Complementarity Problems. Springer, New York (2003)
Fischer, A.: Local behavior of an iterative framework for generalized equations with nonisolated solutions. Math. Program. 94, 91–124 (2002)
Fusek, P.: Isolated zeros of Lipschitzian metrically regular \({\mathbb{R}}^n\)-functions. Optimization 49, 425–446 (2001)
Gfrerer, H.: First-order and second-order characterizations of metric subregularity and calmness of constraint mappings. SIAM J. Optim. 21, 1439–1474 (2011)
Gfrerer, H., Mordukhovich, B.S.: Complete characterizations of tilt stability in nonlinear programming under weakest qualification conditions. SIAM J. Optim. 25, 2081–2119 (2015)
Gfrerer, H., Mordukhovich, B.S.: Robinson stability of parametric constraint systems via variational analysis. SIAM J. Optim. 27, 438–465 (2017)
Gfrerer, H., Outrata, J.V.: On computation of generalized derivatives of the normal cone mapping and their applications. Math. Oper. Res. 41, 1535–1556 (2016)
Henrion, R., Outrata, J.V.: Calmness of constraint systems with applications. Math. Program. 104, 437–464 (2005)
Ioffe, A.D., Outrata, J.V.: On metric and calmness qualification conditions in subdifferential calculus. Set-Valued Anal. 16, 199–227 (2008)
Izmailov, A.F.: On the analytical and numerical stability of critical Lagrange multipliers. Comput. Math. Math. Phys. 45, 930–946 (2005)
Izmailov, A.F.: Tilt and full stability in constrained optimization and the existence of critical Lagrange multipliers, unpublished manuscript, (2015)
Izmailov, A.F., Solodov, M.V.: Stabilized SQP revisited. Math. Program. 133, 93–120 (2012)
Izmailov, A.F., Solodov, M.V.: Newton-Type Methods for Optimization and Variational Problems. Springer, New York (2014)
Izmailov, A.F., Solodov, M.V.: Critical Lagrange multipliers: what we currently know about them, how they spoil our lives, and what we can do about it. TOP 23, 1–26 (2015)
King, A., Rockafellar, R.T.: Sensitivity analysis for nonsmooth generalized equations. Math. Oper. Res. 55, 341–364 (1992)
Klatte, D., Kummer, B.: Nonsmooth Equations in Optimization: Regularity, Calculus, Methods and Applications. Kluwer, Dordrecht (2002)
Klatte, D., Kummer, B.: Aubin property and uniqueness of solutions in cone constrained optimization. Math. Methods Oper. Res. 77, 291–304 (2013)
Levy, A.B.: Implicit multifunction theorems for the sensitivity analysis of variational conditions. Math. Program. 74, 333–350 (1996)
Levy, A.B., Poliquin, R.A., Rockafellar, R.T.: Stability of locally optimal solutions. SIAM J. Optim. 10, 580–604 (2000)
Mordukhovich, B.S.: Complete characterizations of openness, metric regularity, and Lipschitzian properties of multifunctions. Trans. Am. Math. Soc. 340, 1–35 (1993)
Mordukhovich, B.S.: Variational Analysis and Generalized Differentiation, I: Basic Theory; II: Applications. Springer, Berlin (2006)
Mordukhovich, B.S.: Comments on: Critical Lagrange multipliers: what we currently know about them, how they spoil our lives, and what we can do about it. TOP 23, 35–42 (2015)
Mordukhovich, B.S., Nghia, T.T.A.: Full Lipschitzian and Holderian stability in optimization with applications to mathematical programming and optimal control. SIAM J. Optim. 24, 1344–1381 (2014)
Mordukhovich, B.S., Nghia, T.T.A.: Second-order characterizations of tilt stability with applications to nonlinear programming. Math. Program. 149, 83–104 (2015)
Mordukhovich, B.S., Nghia, T.T.A.: Local monotonicity and full stability for parametric variational systems. SIAM J. Optim. 26, 1032–1059 (2016)
Mordukhovich, B.S., Nghia, T.T.A., Rockafellar, R.T.: Full stability in finite-dimensional optimization. Math. Oper. Res. 40, 226–252 (2015)
Mordukhovich, B.S., Outrata, J.V., Ramírez, C.H.: Second-order variational analysis in conic programming with applications to optimality and stability. SIAM J. Optim. 25, 76–101 (2015)
Mordukhovich, B.S., Outrata, J.V., Ramírez, C.H.: Graphical derivatives and stability analysis for parameterized equilibria with conic constraints. Set-Valued Var. Anal. 23, 687–704 (2015)
Mordukhovich, B.S., Rockafellar, R.T., Sarabi, M.E.: Characterizations of full stability in constrained optimization. SIAM J. Optim. 23, 1810–1849 (2013)
Mordukhovich, B.S., Sarabi, M.E.: Variational analysis and full stability of optimal solutions to constrained and minimax problems. Nonlinear Anal. 121, 36–53 (2015)
Mordukhovich, B.S., Sarabi, M.E.: Generalized differentiation of piecewise linear functions in second-order variational analysis. Nonlinear Anal. 132, 240–273 (2016)
Mordukhovich, B.S., Sarabi, M.E.: Second-order analysis of piecewise linear functions with applications to optimization and stability. J. Optim. Theory Appl. 171, 504–526 (2016)
Mordukhovich, B.S., Sarabi, M.E.: Stability analysis for composite optimization problems and parametric variational systems, to appear in. J. Optim. Theory Appl. 172, 554–577 (2017)
Pang, J.-S.: Convergence of splitting and Newton methods for complementarity problems: an application of some sensitivity results. Math. Program. 58, 149–160 (1993)
Poliquin, R.A., Rockafellar, R.T.: Tilt stability of a local minimum. SIAM J. Optim. 8, 287–299 (1998)
Robinson, S.M.: Generalized equations and their solutions, Part I: basic theory. Math. Program. Stud. 10, 128–141 (1979)
Robinson, S.M.: Some continuity properties of polyhedral multifunctions. Math. Program. Stud. 14, 206–214 (1981)
Rockafellar, R.T.: First- and second-order epi-differentiability in nonlinear programming. Trans. Am. Math. Soc. 307, 75–108 (1988)
Rockafellar, R.T., Wets, R.J.-B.: Variational Analysis. Springer, Berlin (1998)
Rockafellar, R.T., Zagrodny, D.: A derivative-coderivative inclusion in second-order nonsmooth analysis. Set-Valued Anal. 5, 1–17 (1997)
Acknowledgements
The first author gratefully acknowledges numerous discussions with Alexey Izmailov and Mikhail Solodov on critical multipliers and related topics. We particularly appreciate sharing with us Izmailov’s instructive notes [17]. We are also indebted to two anonymous referees and the handling editor for their very careful reading of the paper and making helpful remarks that allowed us to improve the original presentation.
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Research of this author was partly supported by the National Science Foundation under Grants DMS-1007132 and DMS-1512846, by the Air Force Office of Scientific Research under Grant #15RT0462, and by the Ministry of Education and Science of the Russian Federation (Agreement Number 02.a03.21.0008 of 24 June 2016).
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Mordukhovich, B.S., Sarabi, M.E. Critical multipliers in variational systems via second-order generalized differentiation. Math. Program. 169, 605–648 (2018). https://doi.org/10.1007/s10107-017-1155-2
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DOI: https://doi.org/10.1007/s10107-017-1155-2
Keywords
- Variational systems
- Composite optimization
- Critical and noncritical multipliers
- Generalized differentiation
- Piecewise linear functions
- Robust isolated calmness
- Lipschitzian stability