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Lower Bounds on Dynamic Programming for Maximum Weight Independent Set

Author Tuukka Korhonen

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LIPIcs.ICALP.2021.87.pdf
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Tuukka Korhonen
  • Department of Computer Science, University of Helsinki, Finland

Funding

This work has been financially supported by Academy of Finland (grant 322869).

Acknowledgements

I wish to thank Prafullkumar Tale for suggesting to generalize the result from planar graphs to H-minor-free graphs. I also thank Matti Järvisalo, Andreas Niskanen, and anonymous reviewers for helpful comments.

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Tuukka Korhonen. Lower Bounds on Dynamic Programming for Maximum Weight Independent Set. In 48th International Colloquium on Automata, Languages, and Programming (ICALP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 198, pp. 87:1-87:14, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.ICALP.2021.87

Abstract

We prove lower bounds on pure dynamic programming algorithms for maximum weight independent set (MWIS). We model such algorithms as tropical circuits, i.e., circuits that compute with max and + operations. For a graph G, an MWIS-circuit of G is a tropical circuit whose inputs correspond to vertices of G and which computes the weight of a maximum weight independent set of G for any assignment of weights to the inputs. We show that if G has treewidth w and maximum degree d, then any MWIS-circuit of G has 2^{Ω(w/d)} gates and that if G is planar, or more generally H-minor-free for any fixed graph H, then any MWIS-circuit of G has 2^{Ω(w)} gates. An MWIS-formula is an MWIS-circuit where each gate has fan-out at most one. We show that if G has treedepth t and maximum degree d, then any MWIS-formula of G has 2^{Ω(t/d)} gates. It follows that treewidth characterizes optimal MWIS-circuits up to polynomials for all bounded degree graphs and H-minor-free graphs, and treedepth characterizes optimal MWIS-formulas up to polynomials for all bounded degree graphs.

Subject Classification

ACM Subject Classification
  • Theory of computation → Graph algorithms analysis
Keywords
  • Maximum weight independent set
  • Treewidth
  • Tropical circuits
  • Dynamic programming
  • Treedepth
  • Monotone circuit complexity

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