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arXiv 1908.08497cs.LGstat.ML
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DynGraph2Seq:用于在线健康论坛中健康阶段预测的动态图到序列可解释学习

DynGraph2Seq: Dynamic-Graph-to-Sequence Interpretable Learning for Health Stage Prediction in Online Health Forums

George Mason University(乔治梅森大学);IBM Research(IBM研究院)

Yuyang Gao, Lingfei Wu, Houman Homayoun, Liang Zhao

摘要:

在线健康社区,如在线乳腺癌论坛,使患者(即,用户)在各种分论坛中进行互动和相互帮助,这些分论坛是主要论坛中专门讨论特定健康主题的子论坛。用户在不同分论坛的活动性质不断变化,这可能是其健康状况变化的有力指标。这些额外的信息可以让医疗机构迅速做出反应,并为患者提供额外的帮助。然而,随着时间的推移,在不同的子论坛之间对单个用户的活动的复杂过渡进行建模,并了解这些活动如何与他/她的健康阶段相对应,这是非常具有挑战性的。在本文中,我们首先制定了用户活动的过渡作为一个动态图与多属性节点,然后形式化的健康阶段推理任务作为一个动态图到序列的学习问题,因此提出了一种新的动态图到序列神经网络架构(DynGraph 2Seq),以解决所有的挑战。我们提出的DynGraph 2Seq模型由一个新的动态图编码器和一个可解释的序列解码器组成,该解码器可以学习一系列随时间演变的用户活动图和一系列目标健康阶段之间的映射。我们继续提出动态图层次注意力机制,以促进必要的多层次的可解释性。一个全面的实验分析,其使用的健康阶段预测任务证明了所提出的模型的有效性和可解释性。

英文摘要:

Online health communities such as the online breast cancer forum enable patients (i.e., users) to interact and help each other within various subforums, which are subsections of the main forum devoted to specific health topics. The changing nature of the users' activities in different subforums can be strong indicators of their health status changes. This additional information could allow health-care organizations to respond promptly and provide additional help for the patient. However, modeling complex transitions of an individual user's activities among different subforums over time and learning how these correspond to his/her health stage are extremely challenging. In this paper, we first formulate the transition of user activities as a dynamic graph with multi-attributed nodes, then formalize the health stage inference task as a dynamic graph-to-sequence learning problem, and hence propose a novel dynamic graph-to-sequence neural networks architecture (DynGraph2Seq) to address all the challenges. Our proposed DynGraph2Seq model consists of a novel dynamic graph encoder and an interpretable sequence decoder that learn the mapping between a sequence of time-evolving user activity graphs and a sequence of target health stages. We go on to propose dynamic graph hierarchical attention mechanisms to facilitate the necessary multi-level interpretability. A comprehensive experimental analysis of its use for a health stage prediction task demonstrates both the effectiveness and the interpretability of the proposed models.

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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