Abstract
Multi-objective optimization plays a key role in the study of real-world problems, as they often involve multiple criteria. In multi-objective optimization it is important to identify the so-called Pareto frontier, which characterizes the trade-offs between the objectives of different solutions. We show how a divide-and-conquer approach, combined with batched processing and pruning, significantly boosts the performance of an exact and approximation dynamic programming (DP) algorithm for computing the Pareto frontier on tree-structured networks, proposed in [18]. We also show how exploiting restarts and a new instance selection strategy boosts the performance and accuracy of a mixed integer programming (MIP) approach for approximating the Pareto frontier. We provide empirical results demonstrating that our DP and MIP approaches have complementary strengths and outperform previous algorithms in efficiency and accuracy. Our work is motivated by a problem in computational sustainability concerning the evaluation of trade-offs in ecosystem services due to the proliferation of hydropower dams throughout the Amazon basin. Our approaches are general and can be applied to computing the Pareto frontier of a variety of multi-objective problems on tree-structured networks.
J.M. Gomes-Selman and Q. Shi—These authors are contributed Equally.
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Acknowledgments
This work was supported by NSF Expedition awards for Computational Sustainability (CCF-1522054 and CNS-0832782), NSF CRI (CNS-1059284) and Cornell University’s Atkinson Center for a Sustainable Future.
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Gomes-Selman, J.M., Shi, Q., Xue, Y., García-Villacorta, R., Flecker, A.S., Gomes, C.P. (2018). Boosting Efficiency for Computing the Pareto Frontier on Tree Structured Networks. In: van Hoeve, WJ. (eds) Integration of Constraint Programming, Artificial Intelligence, and Operations Research. CPAIOR 2018. Lecture Notes in Computer Science(), vol 10848. Springer, Cham. https://doi.org/10.1007/978-3-319-93031-2_19
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