The Complexity of Average-Case Dynamic Subgraph Counting
The Complexity of Average-Case Dynamic Subgraph Counting
复制标题
平均情况动态子图计数的复杂性
DOI:
10.1137/1.9781611977073.23
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
and Saha, Barna
中科院分区:
文献类型:
--
作者:
Henzinger, Monika;Lincoln, Andrea;and Saha, Barna
Statistics of small subgraph counts such as triangles, four-cycles, ands-tpaths of short lengths reveal important structural properties of the underlying graph. These problems have been widely studied in social network analysis. In most relevant applications, the graphs are not only massive but also change dynamically over time. Most of these problems become hard in the dynamic setting when considering the worst case. In this paper, we ask whether the question of small subgraph counting over dynamic graphs is hard also in the average case.We consider the simplest possible average case model where the updates follow an Erdős-Rényi graph: each update selects a pair of vertices (u, v) uniformly at random and flips the existence of the edge (u, v). We develop new lower bounds and matching algorithms in this model for counting four-cycles, counting triangles through a specified points, or a random queried point, andstpaths of length 3, 4 and 5. Our results indicate while computingstpaths of length 3, and 4 are easy in the average case withO(1) update time (note that they are hard in the worst case), it becomes hard when consideringstpaths of length 5.We introduce new techniques which allow us to get average-case hardness for these graph problems from the worst-case hardness of the Online Matrix vector problem (OMv). Our techniques rely on recent advances in fine-grained average-case complexity. Our techniques advance this literature, giving the ability to prove new lower bounds on average-case dynamic algorithms.
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DOI:
10.1145/3396375
发表时间:
2020
期刊:
ACM Transactions on Database Systems (TODS)
影响因子:
--
作者:
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影响因子:
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DOI:
10.1109/focs46700.2020.00077
发表时间:
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期刊:
2020 IEEE 61st Annual Symposium on Foundations of Computer Science (FOCS
影响因子:
--
作者:
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通讯作者:
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DOI:
--
发表时间:
2021
期刊:
Symposium on Algorithmic Foundations of Dynamic Networks
影响因子:
--
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DOI:
10.1145/3375395.3387652
发表时间:
2020
期刊:
PODS 2020
影响因子:
--
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通讯作者:
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