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Poster
Clustering High Dimensional Dynamic Data Streams
Lin Yang · Harry Lang · Christian Sohler · Vladimir Braverman · Gereon Frahling

Wed Aug 09 01:30 AM -- 05:00 AM (PDT) @ Gallery #12
in Posters Wed »
We present data streaming algorithms for the $k$-median problem in high-dimensional dynamic geometric data streams, i.e. streams allowing both insertions and deletions of points from a discrete Euclidean space $\{1, 2, \ldots \Delta\}^d$. Our algorithms use $k \epsilon^{-2} \poly(d \log \Delta)$ space/time and maintain with high probability a small weighted set of points (a coreset) such that for every set of $k$ centers the cost of the coreset $(1+\epsilon)$-approximates the cost of the streamed point set. We also provide algorithms that guarantee only positive weights in the coreset with additional logarithmic factors in the space and time complexities. We can use this positively-weighted coreset to compute a $(1+\epsilon)$-approximation for the $k$-median problem by any efficient offline $k$-median algorithm. All previous algorithms for computing a $(1+\epsilon)$-approximation for the $k$-median problem over dynamic data streams required space and time exponential in $d$. Our algorithms can be generalized to metric spaces of bounded doubling dimension.

Author Information

Lin Yang (Johns Hopkins)
Harry Lang (Johns Hopkins University)
Christian Sohler (TU Dortmund)
Vladimir Braverman (Johns Hopkins University)
Gereon Frahling (Linguee GmbH)

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