Abstract
For a graph G, let Z(G,λ) be the partition function of the monomer-dimer system defined by ∑ k m k (G)λ k, where m k (G) is the number of matchings of size k in G. We consider graphs of bounded degree and develop a sublinear-time algorithm for estimating logZ(G,λ) at an arbitrary value λ > 0 within additive error εn with high probability. The query complexity of our algorithm does not depend on the size of G and is polynomial in 1/ε, and we also provide a lower bound quadratic in 1/ε for this problem. This is the first analysis of a sublinear-time approximation algorithm for a # P-complete problem. Our approach is based on the correlation decay of the Gibbs distribution associated with Z(G,λ). We show that our algorithm approximates the probability for a vertex to be covered by a matching, sampled according to this Gibbs distribution, in a near-optimal sublinear time. We extend our results to approximate the average size and the entropy of such a matching within an additive error with high probability, where again the query complexity is polynomial in 1/ε and the lower bound is quadratic in 1/ε. Our algorithms are simple to implement and of practical use when dealing with massive datasets. Our results extend to other systems where the correlation decay is known to hold as for the independent set problem up to the critical activity.
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Lelarge, M., Zhou, H. (2013). Sublinear-Time Algorithms for Monomer-Dimer Systems on Bounded Degree Graphs. In: Cai, L., Cheng, SW., Lam, TW. (eds) Algorithms and Computation. ISAAC 2013. Lecture Notes in Computer Science, vol 8283. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-45030-3_14
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DOI: https://doi.org/10.1007/978-3-642-45030-3_14
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