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A 2-Approximation Algorithm for Data-Distributed Metric k-Center

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arxiv 2309.04327 v1 pith:YXYZ52SE submitted 2023-09-08 cs.CG cs.DC

classification cs.CGcs.DC
keywords data-distributedalgorithmcenterinputmetricapproximationcenterspoints
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abstract

In a metric space, a set of point sets of roughly the same size and an integer $k\geq 1$ are given as the input and the goal of data-distributed $k$-center is to find a subset of size $k$ of the input points as the set of centers to minimize the maximum distance from the input points to their closest centers. Metric $k$-center is known to be NP-hard which carries to the data-distributed setting. We give a $2$-approximation algorithm of $k$-center for sublinear $k$ in the data-distributed setting, which is tight. This algorithm works in several models, including the massively parallel computation model (MPC).

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  1. Fully Scalable MPC Algorithms for Euclidean k-Center

    cs.DS 2025-04 accept novelty 8.0 of 10

    New constant-round, fully scalable MPC algorithms improve Euclidean k-center approximation to (2+ε) in low dimension and O(log n/log log n) in high dimension.

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