通过锚点路由的专家混合模型,实现时间序列分类的可解释性决策。
AnchorMoE: Interpretable Time Series Classification via Anchor-Routed MoE

- 基于多视图局部片段编码与专家路由,构建可解释的分类框架。
- 在真实与合成数据集上达到领先性能,决策精准锚定关键时序片段。
- 适合临床诊断、工业故障检测等高风险场景,需透明决策的领域。
多变量时间序列分类(MTSC)在临床诊断和工业故障检测等高风险领域至关重要,安全部署要求决策过程透明。然而,真实时间序列中的判别信号通常稀疏、异质且被背景噪声严重遮蔽,难以定位驱动预测的关键时序段。为此,本文提出 AnchorMoE,一种从结构上保证可解释性的分类框架。该框架基于混合专家(MoE)架构,对局部片段进行多视图表示编码,并将其路由至专用专家,使最终预测可精确分解为输入片段的加法组合,实现事前透明,而非依赖事后估计。为确保在稀疏信号分布下的分解可靠性,引入几何正交性约束,惩罚表征冗余,迫使不同专家专攻异质预测模式。此外,设计了一种不确定性感知的可靠性门控机制,动态校准各片段贡献,有效抑制残余背景噪声。在真实世界与合成基准上的大量实验表明,AnchorMoE 在保持高度竞争性分类性能的同时,其决策始终忠实于原始时间序列。
原文摘要 · Abstract (English)
Multivariate time series classification (MTSC) is pivotal in high-stakes domains, such as clinical diagnosis and industrial fault detection, where safe deployment necessitates transparent decision-making. However, isolating the temporal segments that drive model predictions is challenging because discriminative signals in real-world time series are typically sparse, heterogeneous, and heavily obscured by background noise. This paper, therefore, proposes AnchorMoE, an interpretable-by-construction classification framework. Built upon a Mixture-of-Experts (MoE) architecture, AnchorMoE encodes multi-view representations of local patches and routes them to specialized experts, ensuring that the final prediction is formulated as an exact additive decomposition over the input segments, facilitating ante-hoc transparency rather than relying on post-hoc estimations. To maintain the reliability of this decomposition under sparse signal distributions, we introduce a geometric orthogonality constraint that penalizes representational redundancy, compelling distinct experts to specialize in heterogeneous predictive patterns. Furthermore, an uncertainty-aware reliability gate is designed to dynamically calibrate the contribution of each segment, effectively suppressing residual background noise. Extensive experiments on real-world and synthetic benchmarks demonstrate that AnchorMoE achieves highly competitive classification performance while faithfully grounding its decisions in the raw time series.
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