K. Selcuk Candan

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SDMA: Saliency Driven Mutual Cross Attention for Multi-Variate Time Series

Yash Garg, K. Selcuk Candan

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Auto-TLDR; Salient-Driven Mutual Cross Attention for Intelligent Time Series Analytics

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Integration of rich sensory technologies into critical applications, such as gesture recognition and building energy optimization, has highlighted the importance of intelligent time series analytics. To accommodate this demand, uni-variate approaches have been extended for multi-variate scenarios, but naive extensions have lead to deterioration in model performances due to their limited ability to capture the information recorded in different variates and complex multi-variate time series patterns’ evolution over time. Furthermore, real-world time series are often contaminated with noisy information. In this paper, we note that a time series often carry robust localized temporal events that could help improve model performance by highlighting the relevant information; however, the lack of sufficient data to train for these events make it impossible for neural architectures to identify and make use of these temporal events. We, therefore, argue that a companion process helping identify salient events in the input time series and driving model’s attention to the associated salient sub-sequences can help with learning a high-performing network. Relying on this observation, we propose a novel Saliency-Driven Mutual Cross Attention (SDMA) framework that extracts localized temporal events and generate a saliency series to complement the input time series. We further propose an architecture which accounts for the mutual cross-talk between the input and saliency series branches where input and saliency series attend each other. Experiments show that the proposed mutually-cross attention framework can offer significant boosts in model performance when compared against non-attentioned, conventionally attentioned, and conventionally cross-attentioned models.