Decision Diagrams for Optimization


Overview People Publications and software Presentations

Recent News

[9/15/2016] We have added new and updated source codes for several projects, including multi-objective optimization, disjunctive scheduling and routing, and Lagrangian bounds from MDDs. These can be found under Publications and software.

[9/14/2016] Our book Decision Diagrams for Optimization is now available at Springer's website.

[9/8/2016] Andre Cire received Doctoral Research Award from the Association for Constraint Programming for his dissertation "Decision Diagrams for Optimization" at the annual conference on Principles and Practice of Constraint Programming.


(Picture by Helmut Simonis)

[6/20/2016] The slides of the ICAPS tutorials on Decision Diagrams for Discrete Optimization and Decision Diagrams for Sequencing and Scheduling are now available.

[7/10/2015] The slides of the 2015 ACP Summer School lectures on `Decision Diagram based Constraint Programming' are available here: part 1, part 2, part 3.


Overview

In this research project we utilize decision diagrams to represent discrete optimization problems. Decision diagrams provide a compact representation of the solution set of a given problem, although the size may grow exponentially large. We have therefore developed approximate decision diagrams that have a fixed (polynomial) limit on their size.

As an example, consider the following set covering problem on six binary variables:

Figure 1 below depicts an exact binary decision diagram (BDD), representing all solutions to the problem. A shortest path, indicated in blue, represents an optimal solution with objective value 2. This exact BDD has `width' 4, where width stands for the maximum number of nodes in any layer. By imposing a limited maximum width we obtain a relaxed BDD. Figure 2 depicts a relaxed binary decision diagram with maximum width 3. It represents all solutions as well as non-solutions. The shortest path in the relaxed BDD is 1, which serves as a lower bound to the problem.

We have successfully applied decision diagrams in the context of


People

Faculty at Carnegie Mellon University:

Current and former PhD students:


Publications and Software

The documents provided on this page are preprints. The copyright for the published documents rests with the author(s) and the journals or conferences where they were published. Where applicable, the source code and benchmark instances are provided. The software can be freely used but comes with no warranty.

D. Bergman, A. A. Cire, W.-J. van Hoeve, and J. N. Hooker. Decision Diagrams for Optimization. Springer, 2016.

D. Bergman and A. A. Cire. Theoretical insights and algorithmic tools for decision diagram-based optimization. Constraints, to appear.

D. Bergman, A. A. Cire, W.-J. van Hoeve, and J. N. Hooker. Discrete Optimization with Decision Diagrams. INFORMS Journal on Computing 28(1):47-66, 2016.

D. Bergman and A. A. Cire. Multiobjective Optimization by Decision Diagrams. In Proceedings of CP, LNCS 9892, pp 86-95, 2016.

D. Bergman and A. A. Cire. Decomposition Based on Decision Diagrams. In Proceedings of CPAIOR, LNCS 9676, pp 45-54, 2016.

D. Bergman, A. A. Cire, and W.-J. van Hoeve. Improved Constraint Propagation via Lagrangian Decomposition. In Proceedings of CP, LNCS 9255, pp 30-38, 2015.

D. Bergman, A. A. Cire, and W.-J. van Hoeve. Lagrangian Bounds from Decision Diagrams. Constraints 20(3): 346-361, 2015.

B. Kell, A. Sabharwal, and W.-J. van Hoeve. BDD-Guided Clause Generation. In Proceedings of CPAIOR, LNCS 9075, pp. 215-230, 2015.

A. A. Cire. Decision Diagrams for Optimization. PhD thesis, Carnegie Mellon University, 2014.

D. Bergman, A. A. Cire, and W.-J. van Hoeve. MDD Propagation for Sequence Constraints. JAIR, Volume 50, pages 697-722, 2014.

D. Bergman, A. A. Cire, W.-J. van Hoeve, and T. Yunes. BDD-Based Heuristics for Binary Optimization. Journal of Heuristics 20(2): 211-234, 2014.

D. Bergman, A. A. Cire, A. Sabharwal, H. Samulowitz, V. Saraswat, and W.-J. van Hoeve. Parallel Combinatorial Optimization with Decision Diagrams. In Proceedings of CPAIOR, LNCS 8451, pp. 351-367. Springer, 2014.

A. A. Cire and J. N. Hooker. The Separation Problem for Binary Decision Diagrams. In Proceedings of the International Symposium on Artificial Intelligence and Mathematics (ISAIM), 2014.

A. A. Cire and W.-J. van Hoeve. Multivalued Decision Diagrams for Sequencing Problems. Operations Research 61(6): 1411-1428, 2013.

D. Bergman, A. A. Cire, W.-J. van Hoeve, and J. N. Hooker. Optimization Bounds from Binary Decision Diagrams. INFORMS Journal on Computing, to appear.

D. Bergman. New Techniques for Discrete Optimization. PhD thesis, Carnegie Mellon University, 2013.

J. N. Hooker. Decision Diagrams and Dynamic Programming. In Proceedings of CPAIOR. LNCS 7874, pp. 94-110. Springer, 2013.

B. Kell and W.-J. van Hoeve. An MDD Approach to Multidimensional Bin Packing. In Proceedings of CPAIOR, LNCS 7874, pp. 128-143. Springer, 2013.

A. A. Cire and W.-J. van Hoeve. MDD Propagation for Disjunctive Scheduling. In Proceedings of ICAPS, pp. 11-19. AAAI Press, 2012.

D. Bergman, A.A. Cire, W.-J. van Hoeve, and J.N. Hooker. Variable Ordering for the Application of BDDs to the Maximum Independent Set Problem. In Proceedings of CPAIOR. LNCS 7298, pp. 34-49. Springer, 2012.

D. Bergman, W.-J. van Hoeve, and J. N. Hooker. Manipulating MDD Relaxations for Combinatorial Optimization. In Proceedings of CPAIOR. LNCS 6697, pp. 20-35. Springer, 2011.

S. Hoda. Essays on Equilibrium Computation, MDD-based Constraint Programming and Scheduling. PhD thesis, Carnegie Mellon University, 2010.

S. Hoda, W.-J. van Hoeve, and J. N. Hooker. A Systematic Approach to MDD-Based Constraint Programming. In Proceedings of CP. LNCS 6308, pp. 266-280. Springer, 2010.

T. Hadzic, J. N. Hooker, B. O'Sullivan, and P. Tiedemann. Approximate compilation of constraints into multivalued decision diagrams. In Proceedings of CP. LNCS 5202, pp. 448-462. Springer, 2008.

T. Hadzic, J. N. Hooker, and P. Tiedemann. Propagating separable equalities in an MDD store. In Proceedings of CPAIOR. LNCS 5015, pp. 318-322. Springer, 2008.

H. R. Andersen, T. Hadzic, J. N. Hooker, and P. Tiedemann. A constraint store based on multivalued decision diagrams. In Proceedings of CP. LNCS 4741, pp. 118-132. Springer, 2008.

Tarik Hadzic and J. N. Hooker. Cost-bounded binary decision diagrams for 0-1 programming. In Proceedings of CPAIOR. LNCS 4510, pp. 84-98. Springer, 2007.

Tarik Hadzic and J. N. Hooker. Postoptimality analysis for integer programming using binary decision diagrams. December 2007, revised April 2008 (not submitted).


Presentations

Plenary Talks and Tutorials

J. N. Hooker, Decision Diagrams for Discrete Optimization. Tutorial at the International Conference on Automated Planning and Scheduling (ICAPS), 2016.

W.-J. van Hoeve, Decision Diagrams for Sequencing and Scheduling. Tutorial at the International Conference on Automated Planning and Scheduling (ICAPS), 2016.

W.-J. van Hoeve, Decision Diagram based Constraint Programming, ACP Summer School, 2015. part 1, part 2, part 3.

W.-J. van Hoeve, Decision Diagrams for Optimization and Scheduling. MAPSP, 2015.

A. A. Cire, Decision Diagrams for Optimization, MIP, 2015.

W.-J. van Hoeve, Decision Diagrams for Discrete Optimization. Tutorial Forum, Twenty-Seventh AAAI Conference, 2013.
Video's: Part 1, Part 2, Part 3
Solutions to the exercises can also be downloaded.

W.-J. van Hoeve, Constraint Programming with Decision Diagrams. International Conference on Principles and Practice of Constraint Programming (CP), 2012.

W.-J. van Hoeve, Decision Diagrams for Discrete Optimization, MIP, 2011.

J. N. Hooker, Multivalued decision diagrams and what they can do for you. Keynote talk, CP Workshop on Constraint Reasoning and Graphical Structures, 2010.

Other Presentations


Acknowledgements

This research is supported by NSF grant CMMI 1130012, AFOSR grant FA9550-11-1-0180, and a Google Research Award.