A fast approximation scheme for low-dimensional k-means

Publikation: Bidrag til bog/antologi/rapportKonferencebidrag i proceedingsForskningfagfællebedømt

  • Vincent Cohen-Addad

We consider the popular k-means problem in ddimensional Euclidean space. Recently Friggstad, Rezapour, Salavatipour [FOCS'16] and Cohen-Addad, Klein, Mathieu [FOCS'16] showed that the standard local search algorithm yields a p1"q-approximation in time pn kq1-"Opdq, giving the first polynomial-time approximation scheme for the problem in low-dimensional Euclidean space. While local search achieves optimal approximation guarantees, it is not competitive with the state-of-the-art heuristics such as the famous kmeans++ and D2-sampling algorithms. In this paper, we aim at bridging the gap between theory and practice by giving a p1 "q-approximation algorithm for low-dimensional k-means running in time nk plog nqpd" 1qOpdq, and so matching the running time of the k-means++ and D2-sampling heuristics up to polylogarithmic factors. We speed-up the local search approach by making a non-standard use of randomized dissections that allows to find the best local move efficiently using a quite simple dynamic program. We hope that our techniques could help design better local search heuristics for geometric problems.

OriginalsprogEngelsk
TitelProceedings of the Twenty-Ninth Annual ACM-SIAM Symposium on Discrete Algorithms
RedaktørerArtur Czumaj
ForlagSociety for Industrial and Applied Mathematics
Publikationsdato2018
Sider430-440
ISBN (Elektronisk)9781611975031
DOI
StatusUdgivet - 2018
Begivenhed29th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2018 - New Orleans, USA
Varighed: 7 jan. 201810 jan. 2018

Konference

Konference29th Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2018
LandUSA
ByNew Orleans
Periode07/01/201810/01/2018
SponsorACM Special Interest Group on Algorithms and Computation Theory (SIGACT), SIAM Activity Group on Discrete Mathematics

ID: 203834632