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[Seminar] Applying Predicate Detection to Discrete Optimization Problems

Friday, November 19, 2021

11:00 am - 12:00 pm


Online via MSFT Teams


Prof. Vijay Garg
Cullen Trust for Higher Education Endowed Professorship in Engineering
Department of Electrical & Computer Engineering
Department of Computer Science
The University of Texas at Austin


We present a method to design parallel algorithms for the constrained combinatorial optimization problems. Our method solves and generalizes many classical combinatorial optimization problems including the stable marriage problem, the shortest path problem and the market clearing price problem. These three problems are solved in the literature using Gale-Shapley algorithm, Dijkstra’s algorithm, and Demange, Gale, Sotomayor algorithm. Our method solves all these problems by casting them as searching for an element that satisfies an appropriate predicate in a distributive lattice. Moreover, it solves generalizations of all these problems — namely finding the optimal solution satisfying additional constraints called lattice-linear predicates.

For stable marriage problems, an example of such a constraint is that Peter’s regret is less than that of Paul. Our algorithm, called Lattice-Linear Predicate Detection (LLP) can be implemented in parallel with without any locks or compare-and-set instructions. It just assumes atomicity of reads and writes. In addition to finding the optimal solution, our method is useful in enumerating all constrained stable matchings, and all constrained market clearing price vectors.

The talk is an extended version of a paper that appeared in ACM SPAA’20.

About the Speaker

Vijay Garg is a Professor in the Department of Electrical & Computer Engineering and Department of Computer Science at The University of Texas at Austin and holds the Cullen Trust for Higher Education Endowed Professorship in Engineering. He received his Ph.D. in Computer Science at the University of California at Berkeley and B.Tech. in computer science at IIT, Kanpur. His research interests are in distributed computing, discrete event systems and lattice theory. He is the author of “Elements of Distributed Computing” (Wiley, 2002), “Introduction to Lattice Theory with Computer Science Applications” (Wiley, 2015), and “Modeling and Control of Logical Discrete Event Systems” (Springer, 2012). He is an IEEE Fellow.