Robust Estimation for Random Graphs

Robust Estimation for Random Graphs
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发表时间:
2021-11
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通讯作者:
Jayadev Acharya;Ayush Jain;Gautam Kamath;A. Suresh;Huanyu Zhang
Jayadev Acharya;Ayush Jain;Gautam Kamath;A. Suresh;Huanyu Zhang
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作者:
Jayadev Acharya;Ayush Jain;Gautam Kamath;A. Suresh;Huanyu Zhang

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本文研究了Erd\H{o}s-R\'enyi随机图在n个节点上的参数p的鲁棒估计问题,其中n个节点中有一部分节点可能是不利损坏的.在证明了典型估计量的不足之后,我们设计了一个计算效率高的谱算法,该算法估计$p$的精度为$\tilde O(\sqrt{p(1-p)}/n + \gamma\sqrt{p(1-p)} /\sqrt{n}+ \gamma/n)$,其中$\gamma<1/60$。此外,我们给出了一个低效的算法,具有类似的精度为所有$\gamma<1/2$,信息理论的限制。最后,我们证明了一个近似匹配的统计下界,表明我们的算法的误差是最佳的对数因子。
We study the problem of robustly estimating the parameter $p$ of an Erd\H{o}s-R\'enyi random graph on $n$ nodes, where a $\gamma$ fraction of nodes may be adversarially corrupted. After showing the deficiencies of canonical estimators, we design a computationally-efficient spectral algorithm which estimates $p$ up to accuracy $\tilde O(\sqrt{p(1-p)}/n + \gamma\sqrt{p(1-p)} /\sqrt{n}+ \gamma/n)$ for $\gamma<1/60$. Furthermore, we give an inefficient algorithm with similar accuracy for all $\gamma<1/2$, the information-theoretic limit. Finally, we prove a nearly-matching statistical lower bound, showing that the error of our algorithms is optimal up to logarithmic factors.