NDLI: Homomorphisms are a good basis for counting small subgraphs

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Homomorphisms are a good basis for counting small subgraphs

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Homomorphisms are a good basis for counting small subgraphs

Content Provider	ACM Digital Library
Author	Dell, Holger Curticapean, Radu Marx, Dániel
Abstract	We introduce graph motif parameters, a class of graph parameters that depend only on the frequencies of constant-size induced subgraphs. Classical works by LovÃ¡sz show that many interesting quantities have this form, including, for fixed graphsÂ H, the number of H-copies (induced or not) in an input graphÂ G, and the number of homomorphisms fromÂ H to G. We use the framework of graph motif parameters to obtain faster algorithms for counting subgraph copies of fixed graphsÂ H in host graphsÂ G. More precisely, for graphs H on k edges, we show how to count subgraph copies of H in time $k^{O(k)}Â·$ n0.174k + o(k) by a surprisingly simple algorithm. This improves upon previously known running times, such as O(n0.91k + c) time for k-edge matchings or O(n0.46k + c) time for k-cycles. Furthermore, we prove a general complexity dichotomy for evaluating graph motif parameters: Given a class C of such parameters, we consider the problem of evaluating fâ C on input graphs G, parameterized by the number of induced subgraphs that f depends upon. For every recursively enumerable class C, we prove the above problem to be either FPT or #W[1]-hard, with an explicit dichotomy criterion. This allows us to recover known dichotomies for counting subgraphs, induced subgraphs, and homomorphisms in a uniform and simplified way, together with improved lower bounds. Finally, we extend graph motif parameters to colored subgraphs and prove a complexity trichotomy: For vertex-colored graphs H and G, where H is from a fixed class of graphs, we want to count color-preserving H-copies in G. We show that this problem is either polynomial-time solvable or FPT or #W[1]-hard, and that the FPT cases indeed need FPT time under reasonable assumptions. .
Starting Page	210
Ending Page	223
Page Count	14
File Format	PDF
ISBN	9781450345286
DOI	10.1145/3055399.3055502
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-06-19
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Homomorphisms Counting subgraphs Exponential time hypothesis Fixed-parameter tractability
Content Type	Text
Resource Type	Article

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