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arXiv 1909.03217math.STstat.TH
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非齐次随机图中植物群落的检测

Detecting a planted community in an inhomogeneous random graph

Kay Bogerd, Rui M. Castro, Remco van der Hofstad, Nicolas Verzelen

摘要:

研究了非齐次随机图中是否存在种植群落的判定问题。具体来说,我们观察到一个图的单一实现。在原假设下,该图是来自非齐次随机图的样本,而在另一种情况下,存在一个小的子图,其中边缘概率通过乘法缩放因子增加。我们提出了一个扫描测试,能够检测到存在这样一个种植社区,即使这个社区是非常小的,底层的图形是不均匀的。我们还推导出这个问题的信息论下界,这表明在某些制度的扫描测试几乎是渐近最优的。我们通过例子和数值实验来说明我们的结果。

英文摘要:

We study the problem of detecting whether an inhomogeneous random graph contains a planted community. Specifically, we observe a single realization of a graph. Under the null hypothesis, this graph is a sample from an inhomogeneous random graph, whereas under the alternative, there exists a small subgraph where the edge probabilities are increased by a multiplicative scaling factor. We present a scan test that is able to detect the presence of such a planted community, even when this community is very small and the underlying graph is inhomogeneous. We also derive an information theoretic lower bound for this problem which shows that in some regimes the scan test is almost asymptotically optimal. We illustrate our results through examples and numerical experiments.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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