聚类分析
黎曼流形
数学
歧管对齐
黎曼几何
歧管(流体力学)
线性子空间
背景(考古学)
核(代数)
特征(语言学)
计算机科学
人工智能
模式识别(心理学)
算法
非线性降维
纯数学
降维
机械工程
生物
工程类
哲学
古生物学
语言学
作者
Konstantinos Slavakis,Shiva Salsabilian,David S. Wack,Sarah F. Muldoon,Henry E. Baidoo‐Williams,Jean M. Vettel,Matthew Cieslak,Scott T. Grafton
摘要
This paper introduces Riemannian multi-manifold modeling in the context of brain-network analytics: Brainnetwork time-series yield features which are modeled as points lying in or close to a union of a finite number of submanifolds within a known Riemannian manifold. Distinguishing disparate time series amounts thus to clustering multiple Riemannian submanifolds. To this end, two feature-generation schemes for brain-network time series are put forth. The first one is motivated by Granger-causality arguments and uses an auto-regressive moving average model to map low-rank linear vector subspaces, spanned by column vectors of appropriately defined observability matrices, to points into the Grassmann manifold. The second one utilizes (non-linear) dependencies among network nodes by introducing kernel-based partial correlations to generate points in the manifold of positivedefinite matrices. Based on recently developed research on clustering Riemannian submanifolds, an algorithm is provided for distinguishing time series based on their Riemannian-geometry properties. Numerical tests on time series, synthetically generated from real brain-network structural connectivity matrices, reveal that the proposed scheme outperforms classical and state-of-the-art techniques in clustering brain-network states/structures.
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