On generating maximal nondominated Benders cuts

Abstract

In this paper, we explore certain algorithmic strategies for accelerating the con- vergence of Benders decomposition method via the generation of maximal nondominated cuts. Based on interpreting the seminal work of Magnanti and Wong (Operations Research, 29(3), 464-484, 1981) for generating nondominated cuts within a multiobjective frame- work, we propose an algorithmic strategy that utilizes a preemptively small perturbation of the right-hand-side of the Benders subproblem to generate maximal nondominated Benders cuts, as well as a complimentary strategy that generates an additional cut in each iteration via an alternative emphasis on decision variable weights. We also examine the computa- tional effectiveness of solving a secondary subproblem using an objective cut as proposed by Magnanti and Wong versus identifying the Pareto-optimality region for cut generation by utilizing complementary slackness conditions. In addition, we exhibit how a standard fea- sibility cut can be extracted from the solution of subproblems that generate only optimality cuts through the use of artificial variables. With Magnanti and Wong's baseline procedure approximated during implementation via the use of a core point estimation technique (Pa- padakos in Computers and Operations Research, 36(1), 176-195, 2009), these algorithmic strategies are tested on instances from the literature concerning the fixed charge network flow program.