,
Jonathan Meiri
Creative Commons Attribution 4.0 International license
In this paper we study the problem of tolerantly testing the property of being H-free (which also implies distance approximation from being H-free). In the general-graphs model, we show that for tolerant K_k-freeness testing can be achieved with query complexity that is polynomial in the arboricity of the input graph G, arb(G), and independent of the size of G (for graphs in which the average degree is Ω(1)). Specifically for triangles, our algorithm distinguished graphs which are ε-close to being triangle-free from graphs that 3ε(1+η)-far from being triangle-free with expected query complexity which is Õ(arb³(G)) (for constant η and ε). For general k-cliques our algorithm distinguishes graphs which are ε-close to being K_k-free from graphs which are binom(k,2)ε(1+η)-far from being K_k-free with expected query complexity which is polynomial in k, ε, γ and arb(G). We then generalize our result and provide a similar result for any motif H which is 2-connected of radius 1. This includes for example the wheel-graph. Finally, we show that our tester can be applied to the bounded-degree model for tolerantly testing H-freeness for any motif H. The query complexity of the algorithm is polynomial in the degree bound, d, improving the previous state-of-the-art by Marko and Ron (TALG 2009) that obtained quasi-polynomial query complexity in d.
@InProceedings{levi_et_al:LIPIcs.ESA.2025.77,
author = {Levi, Reut and Meiri, Jonathan},
title = {{Tolerant Testers for Subgraph-Freeness}},
booktitle = {33rd Annual European Symposium on Algorithms (ESA 2025)},
pages = {77:1--77:15},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-395-9},
ISSN = {1868-8969},
year = {2025},
volume = {351},
editor = {Benoit, Anne and Kaplan, Haim and Wild, Sebastian and Herman, Grzegorz},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2025.77},
URN = {urn:nbn:de:0030-drops-245456},
doi = {10.4230/LIPIcs.ESA.2025.77},
annote = {Keywords: Tolerant Testing, Property Testing, Subgraph freeness, distance approximation, arboricity}
}