Robust Testing in High-Dimensional Sparse Models
Robust Testing in High-Dimensional Sparse Models
复制标题
高维稀疏模型中的稳健测试
DOI:
10.48550/arxiv.2205.07488
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
C. Canonne
中科院分区:
文献类型:
--
作者:
Anand George;C. Canonne
We consider the problem of robustly testing the norm of a high-dimensional sparse signal vector under two different observation models. In the first model, we are given $n$ i.i.d. samples from the distribution $\mathcal{N}\left(\theta,I_d\right)$ (with unknown $\theta$), of which a small fraction has been arbitrarily corrupted. Under the promise that $\|\theta\|_0\le s$, we want to correctly distinguish whether $\|\theta\|_2=0$ or $\|\theta\|_2>\gamma$, for some input parameter $\gamma>0$. We show that any algorithm for this task requires $n=\Omega\left(s\log\frac{ed}{s}\right)$ samples, which is tight up to logarithmic factors. We also extend our results to other common notions of sparsity, namely, $\|\theta\|_q\le s$ for any $0<q<2$. In the second observation model that we consider, the data is generated according to a sparse linear regression model, where the covariates are i.i.d. Gaussian and the regression coefficient (signal) is known to be $s$-sparse. Here too we assume that an $\epsilon$-fraction of the data is arbitrarily corrupted. We show that any algorithm that reliably tests the norm of the regression coefficient requires at least $n=\Omega\left(\min(s\log d,{1}/{\gamma^4})\right)$ samples. Our results show that the complexity of testing in these two settings significantly increases under robustness constraints. This is in line with the recent observations made in robust mean testing and robust covariance testing.
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DOI:
--
发表时间:
2020-05
期刊:
--
影响因子:
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作者:
Matthew Brennan;Guy Bresler
通讯作者:
Matthew Brennan;Guy Bresler
DOI:
--
发表时间:
2021
期刊:
2021
影响因子:
--
作者:
Ilias Diakonikolas;Daniel M. Kane
通讯作者:
Daniel M. Kane
DOI:
--
发表时间:
2019
期刊:
Proceedings of Machine Learning Research
影响因子:
--
作者:
Reeves, Galen;Xu, Jiaming;Zadik, Ilias
通讯作者:
Zadik, Ilias
DOI:
--
发表时间:
2019
期刊:
Advances in neural information processing systems
影响因子:
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作者:
Diakonikolas, Ilias;Kane, Daniel;Karmalkar, Sushrut;Price, Eric;Stewart, Alistair
通讯作者:
Stewart, Alistair