2006
DOI: 10.1287/opre.1050.0262
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Solving Large-Scale Linear Multicommodity Flow Problems with an Active Set Strategy and Proximal-ACCPM

Abstract: In this paper, we propose to solve the linear multicommodity flow problem using a partial Lagrangian relaxation. The relaxation is restricted to the set of arcs that are likely to be saturated at the optimum. This set is itself approximated by an active set strategy. The partial Lagrangian dual is solved with Proximal-ACCPM, a variant of the analytic center cutting plane method. The new approach makes it possible to solve huge problems when few arcs are saturated at the optimum, as it appears to be the case in… Show more

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Cited by 35 publications
(48 citation statements)
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“…Regularizations based on proximal terms have also been applied in the proximal analytic center cutting plane method (proximal-ACCPM) for multicommodity flows [3]. However, unlike our approach, the proximal term did not improve the performance of proximal-ACCPM, but just simplified the tuning of parameters with respect to ACCPM.…”
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confidence: 98%
“…Regularizations based on proximal terms have also been applied in the proximal analytic center cutting plane method (proximal-ACCPM) for multicommodity flows [3]. However, unlike our approach, the proximal term did not improve the performance of proximal-ACCPM, but just simplified the tuning of parameters with respect to ACCPM.…”
mentioning
confidence: 98%
“…By duality, any feasible solution of (13) provides a lower bound for the original problem (1). Taking the values returned by the two oracles at the successive query points, we obtain the lower bound θ = max …”
Section: Upper and Lower Boundsmentioning
confidence: 99%
“…This results in a reduction of the dimension of the Lagrangian dual space and easier calculation of analytic center. This strategy has been implemented with success in [1] and can be described as an active set strategy aiming to find and eliminate unsaturated arcs. In the nonlinear case, the strategy is applied to arcs on which the optimal flow lies in a region where the cost function is well approximated by a linear function.…”
Section: Introductionmentioning
confidence: 99%
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“…Solution strategies to deal with this class of problems can be broadly classified into simplex-based methods [14,23], decomposition methods [17,1,2,27], approximation methods [5], and interiorpoint methods [10,21]. One of the most efficient interior-point methods (IPMs) for some classes of block-angular problems solves normal equations by a combination of Cholesky factorizations for the block constraints and preconditioned conjugate gradient (PCG) iterations for the linking constraints [10,11].…”
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confidence: 99%