Parameterized Streaming: Maximal Matching and Vertex Cover
Parameterized Streaming: Maximal Matching and Vertex Cover
复制标题
参数化流:最大匹配和顶点覆盖
DOI:
10.1137/1.9781611973730.82
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Morteza Monemizadeh
中科院分区:
文献类型:
--
作者:
Rajesh Hemant Chitnis;Graham Cormode;Mohammad Taghi Hajiaghayi;Morteza Monemizadeh
As graphs continue to grow in size, we seek ways to effectively process such data at scale. The model of streaming graph processing, in which a compact summary is maintained as each edge insertion/deletion is observed, is an attractive one. However, few results are known for optimization problems over such dynamic graph streams.In this paper, we introduce a new approach to handling graph streams, by instead seeking solutions for the parameterized versions of these problems. Here, we are given a parameterkand the objective is to decide whether there is a solution bounded byk. By combining kernelization techniques with randomized sketch structures, we obtain the first streaming algorithms for the parameterized versions of Maximal Matching and Vertex Cover. We consider various models for a graph stream onnnodes: the insertion-only model where the edges can only be added, and the dynamic model where edges can be both inserted and deleted. More formally, we show the following results:In the insertion only model, there is a one-pass deterministic algorithm for the parameterized Vertex Cover problem which computes a sketch usingÕ(k2) space1such that at each timestamp in timeÕ(2k) it can either extract a solution of size at mostkfor the current instance, or report that no such solution exists. We also show a tight lower bound of Ω(k2) for the space complexity of any (randomized) streaming algorithms for the parameterized Vertex Cover, even in the insertion-only model.In the dynamic model, and under thepromisethat at each timestamp there is a maximal matching of size at mostk, there is a one-passÕ(k2)-space (sketch-based) dynamic algorithm that maintains a maximal matching with worst-case update timeÕ(k2). This algorithm partially solves Open Problem 64 from [1]. An application of this dynamic matching algorithm is a one-passÕ(k2)-space streaming algorithm for the parameterized Vertex Cover problem that in timeÕ(2k) extracts a solution for the final instance with probability 1 – δ/no(1),whereδ< 1. To the best of our knowledge, this is the first graph streaming algorithm that combines linear sketching with sequential operations that depend on the graph at the current time.In the dynamic model without any promise, there is a one-pass randomized algorithm for the parameterized Vertex Cover problem which computes a sketch usingÕ(nk) space such that in timeÕ(nk +2k) it can either extract a solution of size at mostkfor the final instance, or report that no such solution exists.
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DOI:
10.1145/1806689.1806753
发表时间:
2010
期刊:
Random Struct. Algorithms
影响因子:
--
作者:
Krzysztof Onak;R. Rubinfeld
通讯作者:
R. Rubinfeld
影响因子:
4.4
作者:
Ofer Neiman;Shay Solomon
通讯作者:
Shay Solomon
DOI:
--
发表时间:
2011
期刊:
IEEE Annual Symposium on Foundations of Computer Science
影响因子:
--
作者:
Surender Baswana;Manoj Gupta;Sandeep Sen
通讯作者:
Sandeep Sen
DOI:
10.1007/978-0-387-39940-9_184
发表时间:
2009
期刊:
Proceedings of the twenty-seventh ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
影响因子:
--
作者:
A. Mcgregor
通讯作者:
A. Mcgregor
影响因子:
1.1
作者:
Krzysztof Onak;D. Ron;M. Rosen;R. Rubinfeld
通讯作者:
R. Rubinfeld