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Inference of Cascades and Correlated Networks- [electronic resource]
Inference of Cascades and Correlated Networks - [electronic resource]
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Inference of Cascades and Correlated Networks- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214100455
ISBN  
9798379719210
DDC  
310
저자명  
Sridhar, Anirudh.
서명/저자  
Inference of Cascades and Correlated Networks - [electronic resource]
발행사항  
[S.l.]: : Princeton University., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(239 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Advisor: Poor, H. Vincent;Racz, Miklos Z.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2023.
사용제한주기  
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초록/해제  
요약This thesis makes fundamental contributions to a few statistical inference tasks on networks, with a focus on information-theoretic characterizations. In the first part of this thesis, we study the problem of localizing a network cascade from noisy, real-time measurements of its spread (i.e., through error-prone diagnostic tests). Our objective is to design algorithms that can estimate the cascade source as fast as possible, so that the impact of the cascade on the network can be mitigated. We design estimation procedures from Bayesian and minimax perspectives. In the Bayesian setting, we propose an estimator which observes samples until the error of the Bayes-optimal estimator falls below a threshold. In the minimax setting, we devise a novel multihypothesis sequential probability ratio test (MSPRT) for source estimation. When estimating simple cascades in trees and lattices, we show that both methods are optimal, in the sense that no other algorithm can accurately estimate the source with a substantially smaller number of samples. Finally, we discuss how our methods may be extended to estimate realistic cascades in generic networks.In the second part of this thesis, we study graph matching and community recovery in networks with correlated structure. First, we derive the precise information-theoretic threshold for fully recovering the latent vertex correspondence between two edge-correlated stochastic block models - a task known as exact graph matching. We then characterize the information-theoretic landscape of community recovery in correlated stochastic block models, which requires a delicate interplay between graph matching and community recovery algorithms. In particular, we uncover and characterize a region of the parameter space where exact community recovery is possible using multiple correlated graphs, even though (1) this is information-theoretically impossible using a single graph and (2) exact graph matching is also information-theoretically impossible. In this regime, we develop a novel algorithm that carefully synthesizes community recovery and graph matching algorithms.
일반주제명  
Statistics.
일반주제명  
Applied mathematics.
일반주제명  
Electrical engineering.
키워드  
Community recovery
키워드  
Graph matching
키워드  
Hypothesis testing
키워드  
Network cascades
키워드  
Stochastic block model
키워드  
Susceptible-infected process
기타저자  
Princeton University Electrical and Computer Engineering
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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