TY - GEN

T1 - Brief announcement

T2 - 27th ACM Symposium on Parallelism in Algorithms and Architectures, SPAA 2015

AU - Levi, Reut

AU - Rubinfeld, Ronitt

AU - Yodpinyanee, Anak

N1 - Publisher Copyright:
Copyright © 2015 ACM.

PY - 2015/6/13

Y1 - 2015/6/13

N2 - In the model of local computation algorithms (LCAs), we aim to compute the queried part of the output by examining only a small (sublinear) portion of the input. This key aspect of LCAs generalizes various other models such as parallel algorithms, local filters and reconstructors. For graph problems, design techniques for LCAs and distributed algorithms are closely related and have been proven useful in each other's context. Many recently developed LCAs on graph problems achieve time and space complexities with very low dependence on n, the number of vertices. Nonetheless, these complexities are generally at least exponential in d, the upper bound on the degree of the input graph. We consider the case where the parameter d can be moderately dependent on n, and aim for complexities with subexponential dependence on d, while maintaining polylogarithmic dependence on n. We present: • a randomized LCA for computing maximal independent sets whose time and space complexities are quasipolynomial in d and polylogarithmic in n; • for constant ∈ > 0, a randomized LCA that provides a (1 - ∈)-approximation to maximum matching with high probability, whose time and space complexities are polynomial in d and polylogarithmic in n.

AB - In the model of local computation algorithms (LCAs), we aim to compute the queried part of the output by examining only a small (sublinear) portion of the input. This key aspect of LCAs generalizes various other models such as parallel algorithms, local filters and reconstructors. For graph problems, design techniques for LCAs and distributed algorithms are closely related and have been proven useful in each other's context. Many recently developed LCAs on graph problems achieve time and space complexities with very low dependence on n, the number of vertices. Nonetheless, these complexities are generally at least exponential in d, the upper bound on the degree of the input graph. We consider the case where the parameter d can be moderately dependent on n, and aim for complexities with subexponential dependence on d, while maintaining polylogarithmic dependence on n. We present: • a randomized LCA for computing maximal independent sets whose time and space complexities are quasipolynomial in d and polylogarithmic in n; • for constant ∈ > 0, a randomized LCA that provides a (1 - ∈)-approximation to maximum matching with high probability, whose time and space complexities are polynomial in d and polylogarithmic in n.

KW - Local computation algorithms

KW - Maximal independent set

KW - Maximum matching

UR - http://www.scopus.com/inward/record.url?scp=84950283822&partnerID=8YFLogxK

U2 - 10.1145/2755573.2755615

DO - 10.1145/2755573.2755615

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AN - SCOPUS:84950283822

T3 - Annual ACM Symposium on Parallelism in Algorithms and Architectures

SP - 59

EP - 61

BT - SPAA 2015 - Proceedings of the 27th ACM Symposium on Parallelism in Algorithms and Architectures

PB - Association for Computing Machinery

Y2 - 13 June 2015 through 15 June 2015

ER -