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arXiv 2111.01271cs.LG
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基于累积自回归自注意力的脑动力学研究

Brain dynamics via Cumulative Auto-Regressive Self-Attention

Tri-institutional Center for Translational Research in Neuroimaging and Data Science (TReNDS)(神经影像与数据科学转化研究三机构中心(TReNDS));Georgia State University(佐治亚州立大学);Georgia Tech(佐治亚理工学院);Emory(埃默里大学)

Usman Mahmood, Zening Fu, Vince Calhoun, Sergey Plis

摘要:

多变量动态过程通常可以通过代表每个单独时间序列的组件之间的加权连接图来直观地描述。即使是一个简单的表示为皮尔逊相关矩阵的图形可以提供信息和预测,在脑成像文献中证明。然而,有一个共识期望,强大的图神经网络(GNN)应该在类似的设置中表现得更好。在这项工作中,我们提出了一个比深度GNN浅得多的模型,但在脑成像应用中的预测准确性方面优于它们。我们的模型学习个体时间序列的自回归结构,并通过自注意力机制以端到端的方式估计学习到的表示之间的有向连接图。作为患者和对照之间的分类器的模型的监督训练导致生成有向连接图并突出显示对每个受试者具有预测性的时间序列的分量的模型。我们展示了我们的结果对功能神经影像数据集分类精神分裂症患者和对照。

英文摘要:

Multivariate dynamical processes can often be intuitively described by a weighted connectivity graph between components representing each individual time-series. Even a simple representation of this graph as a Pearson correlation matrix may be informative and predictive as demonstrated in the brain imaging literature. However, there is a consensus expectation that powerful graph neural networks (GNNs) should perform better in similar settings. In this work, we present a model that is considerably shallow than deep GNNs, yet outperforms them in predictive accuracy in a brain imaging application. Our model learns the autoregressive structure of individual time series and estimates directed connectivity graphs between the learned representations via a self-attention mechanism in an end-to-end fashion. The supervised training of the model as a classifier between patients and controls results in a model that generates directed connectivity graphs and highlights the components of the time-series that are predictive for each subject. We demonstrate our results on a functional neuroimaging dataset classifying schizophrenia patients and controls.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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