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Decomposition algorithm for convex differentiable minimization. (English) Zbl 0739.90052
Summary: We propose a decomposition algorithm for convex differentiable minimization. This algorithm at each iteration solves a variational inequality problem obtained by adding to the gradient of the cost function a strongly proximal related function. A line search is then performed in the direction of the solution to this variational inequality (with respect to the original cost). If the constraint set is a Cartesian product of $$m$$ sets, the variational inequality decomposes into $$m$$ coupled variational inequalities, which can be solved in either a Jacobi manner or a Gauss-Seidel manner. This algorithm also applies to the minimization of a strongly convex (possibly nondifferentiable) cost subject to linear constraints. As special cases, we obtain the GP-SOR algorithm of O. Mangasarian and R. De Leone [Ann. Oper. Res. 14, 41–59 (1988; Zbl 0739.90068)], a diagonalization algorithm of B. Feijoo and R. R. Meyer [Manage. Sci. 34, No. 3, 411–419 (1988; Zbl 0648.90059)], the coordinate descent method, and the dual gradient method. This algorithm is also closely related to a splitting algorithm of D. Gabay [in: M. Fortin and R. Glowinski (eds.), “Augmented Lagrangian methods: application to the numerical solution of boundary-value problems”, Stud. Math. Appl. 15, 299–331 (1983; Zbl 0525.65045)] and a gradient projection algorithm of A. A. Goldstein [Bull. Am. Math. Soc. 70, 709–710 (1964; Zbl 0142.17101)) and of E. S. Levitin and B. T. Polyak [Zh. Vychisl. Mat. Mat. Fiz. 6, 787–823 (1966); translation in USSR Comput. Math. Math. Phys. 6 (1966), No. 5, 1–50 (1968; Zbl 0184.38902)] and has interesting applications to separable convex programming and to solving traffic assignment problems.

##### MSC:
 90C25 Convex programming 49J40 Variational inequalities 65K05 Numerical mathematical programming methods 90-08 Computational methods for problems pertaining to operations research and mathematical programming 90C33 Complementarity and equilibrium problems and variational inequalities (finite dimensions) (aspects of mathematical programming) 49M27 Decomposition methods
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