Covariance Kernels on Unordered Pair Spaces: Theory and Applications to Network-Valued Data
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无序对空间上的协方差核:理论与网络数据应用AI 解读 ↓
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Many scientific problems are relational: the quantity of interest is a connection between two objects, while information about similarity is available for the objects themselves. We develop a covariance framework for unordered relationships that transfers object-level geometry to the relations they form while preserving endpoint identity and invariance to ordering. Building on symmetric pairwise-kernel representations, we develop theory for the loop-free domains used in undirected networks. We establish spectral interlacing and trace-loss results after self-pairs are removed, connect the relational spectrum to regularization and risk, derive an exact inferential error for spectral truncation, and quantify how perturbations of the underlying geometry propagate to pair covariance and estimation. Simulations show when structured borrowing improves estimation and how geometric misspecification can erode that benefit. We apply the framework to autism neuroimaging using resting-state functional-connectivity data from the Autism Brain Imaging Data Exchange (ABIDE). With a 116-region parcellation and 6,670 unique connections, the application shows that a large connectome can have a much smaller effective covariance dimension. It also demonstrates that high explained covariance alone is insufficient for choosing a low-rank representation when inferential accuracy is the goal. The framework provides a principled foundation for covariance and regularization when the statistical units are unordered relationships.
用于诊断事件流高阶时间依赖的超边触发 Hawkes 过程
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This paper studies convolution rank regression (CRR) over decentralized distributed learning networks. We propose a novel decentralized CRR framework, in which estimators are obtained by solving consensus-constrained optimization with kernel-smoothed rank loss. The developed estimation scheme relies solely on local node data and information shared by neighboring nodes, thereby achieving privacy preservation and high communication efficiency. For heterogeneous network…
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多层网络一致社区检测的谱方法与矩阵分解方法
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当处理发生溢出:时空因果效应估计的神经网络框架
Real-world public health policies are often enacted by local jurisdictions, but their effects can ripple through connected populations. For causal evaluation, this creates a difficult spatiotemporal problem: intermittent policy updates create path-level treatments, and because spillover depends on neighboring treatment paths along with the focal-unit's own history, controlling time-varying confounding requires high-dimensional, multimodal information from both sources. To…