论文标题

P2EXNET:基于补丁的原型说明网络

P2ExNet: Patch-based Prototype Explanation Network

论文作者

Mercier, Dominique, Dengel, Andreas, Ahmed, Sheraz

论文摘要

深度学习方法在几个领域中表现出了巨大的成功,因为它们有效地处理了大量数据,能够解决复杂的分类,预测,细分和其他任务。但是,它们具有遥不可及的固有缺点,从而限制了其适用性和可信赖性。尽管存在解决这一观点的工作,但由于直观和突出的概念,大多数现有方法都限于图像方式。相反,时间序列领域中的概念更加复杂和不整合,但是这些以及网络决策的解释在关键领域(如医疗,金融或行业)中至关重要。为了满足对一种可解释方法的需求,我们提出了一种新颖的可解释网络方案,旨在固有地使用受人类认知启发的可解释的推理过程,而无需其他事后解释性方法。因此,使用特定于类的补丁,因为它们涵盖了与分类相关的本地概念,以揭示与同一类样品的相似性。此外,我们引入了有关解释性和准确性的新颖损失,该损失限制了P2EXNET的可行解释,包括相关贴片,其位置,类别的相似性和比较方法,而不会损害准确性。对八个公开可用的时间序列数据集的结果分析表明,与同行相比,P2EXNET在固有提供可理解和可追溯的决策的同时,达到了可比的性能。

Deep learning methods have shown great success in several domains as they process a large amount of data efficiently, capable of solving complex classification, forecast, segmentation, and other tasks. However, they come with the inherent drawback of inexplicability limiting their applicability and trustworthiness. Although there exists work addressing this perspective, most of the existing approaches are limited to the image modality due to the intuitive and prominent concepts. Conversely, the concepts in the time-series domain are more complex and non-comprehensive but these and an explanation for the network decision are pivotal in critical domains like medical, financial, or industry. Addressing the need for an explainable approach, we propose a novel interpretable network scheme, designed to inherently use an explainable reasoning process inspired by the human cognition without the need of additional post-hoc explainability methods. Therefore, class-specific patches are used as they cover local concepts relevant to the classification to reveal similarities with samples of the same class. In addition, we introduce a novel loss concerning interpretability and accuracy that constraints P2ExNet to provide viable explanations of the data including relevant patches, their position, class similarities, and comparison methods without compromising accuracy. Analysis of the results on eight publicly available time-series datasets reveals that P2ExNet reaches comparable performance when compared to its counterparts while inherently providing understandable and traceable decisions.

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