论文标题

与混合体系结构进行时间序列分类的多方面表示学习

Multi-Faceted Representation Learning with Hybrid Architecture for Time Series Classification

论文作者

Liu, Zhenyu, Cheng, Jian

论文摘要

时间序列分类问题存在于许多领域,并且已经探索了几十年。但是,它们仍然具有挑战性,就准确性和效率而言,需要进一步改善现实应用程序的解决方案。在本文中,我们提出了一种混合神经架构,称为自我煽动性的卷积网络(SARCON),以学习单变量时间序列的多方面表示。 SARCON是具有具有自动机制和完全卷积网络的长短期记忆网络的综合,它们与从不同角度学习单变量时间序列的表示形式合作。所提出的体系结构的组件模块以端到端的方式共同训练,它们以合作的方式对输入时间序列进行了分类。由于其领域不足的性质,SARCON能够概括各种域任务。我们的实验结果表明,与时间序列分类的最新方法相比,所提出的体系结构可以为UCR存储库的一组单变量时间序列基准获得显着改进。此外,通过促进原始时间序列的贡献区域的识别,自我注意力和全球平均汇集可以使可见的解释性。总体分析证实,时间序列的多方面表示可以捕获复杂时间序列中的深度时间校正,这对于改善时间序列分类性能至关重要。我们的工作提供了一个新颖的角度,可以加深对时间序列分类的理解,并将我们提出的模型作为现实应用程序的理想选择。

Time series classification problems exist in many fields and have been explored for a couple of decades. However, they still remain challenging, and their solutions need to be further improved for real-world applications in terms of both accuracy and efficiency. In this paper, we propose a hybrid neural architecture, called Self-Attentive Recurrent Convolutional Networks (SARCoN), to learn multi-faceted representations for univariate time series. SARCoN is the synthesis of long short-term memory networks with self-attentive mechanisms and Fully Convolutional Networks, which work in parallel to learn the representations of univariate time series from different perspectives. The component modules of the proposed architecture are trained jointly in an end-to-end manner and they classify the input time series in a cooperative way. Due to its domain-agnostic nature, SARCoN is able to generalize a diversity of domain tasks. Our experimental results show that, compared to the state-of-the-art approaches for time series classification, the proposed architecture can achieve remarkable improvements for a set of univariate time series benchmarks from the UCR repository. Moreover, the self-attention and the global average pooling in the proposed architecture enable visible interpretability by facilitating the identification of the contribution regions of the original time series. An overall analysis confirms that multi-faceted representations of time series aid in capturing deep temporal corrections within complex time series, which is essential for the improvement of time series classification performance. Our work provides a novel angle that deepens the understanding of time series classification, qualifying our proposed model as an ideal choice for real-world applications.

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