On Regularity Lemma and Barriers in Streaming and Dynamic Matching
On Regularity Lemma and Barriers in Streaming and Dynamic Matching
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流媒体和动态匹配中的正则引理和障碍
DOI:
10.1145/3564246.3585110
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Li, Huan
中科院分区:
文献类型:
--
作者:
Assadi, Sepehr;Behnezhad, Soheil;Khanna, Sanjeev;Li, Huan
We present a new approach for finding matchings in dense graphs by building on Szemerédi’s celebrated Regularity Lemma. This allows us to obtain non-trivial albeit slight improvements over longstanding bounds for matchings in streaming and dynamic graphs. In particular, we establish the following results forn-vertex graphs:A deterministicsingle-pass streamingalgorithm that finds a (1−o(1))-approximate matching ino(n2) bits of space. This constitutes the first single-pass algorithm for this problem in sublinear space that improves over the 1/2-approximation of the greedy algorithm.A randomizedfully dynamicalgorithm that with high probability maintains a (1−o(1))-approximate matching ino(n) worst-case update time per each edge insertion or deletion. The algorithm works even against an adaptive adversary. This is the firsto(n) update-time dynamic algorithm with approximation guarantee arbitrarily close to one.Given the use of regularity lemma, the improvement obtained by our algorithms over trivial bounds is only by some (log*n)Θ(1)factor. Nevertheless, in each case, they show that the “right” answer to the problem is not what is dictated by the previous bounds.Finally, in the streaming model, we also present a randomized (1−o(1))-approximation algorithm whose space can be upper bounded by the density of certain Ruzsa-Szemerédi (RS) graphs. While RS graphs by now have been used extensively to prove streaming lower bounds, ours is the first to use them as an upper bound tool for desigining improved streaming algorithms.
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