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arXiv 2204.03342cs.LGcs.AI
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用于缓解协变量偏移的时间序列分类领域自适应方法

Domain Adaptation for Time-Series Classification to Mitigate Covariate Shift

Fraunhofer IIS(弗劳恩霍夫集成电路研究所);LMU Munich(慕尼黑大学);RWTH Aachen(亚琛工业大学)

Felix Ott, David Rügamer, Lucas Heublein, Bernd Bischl, Christopher Mutschler

AI总结:

针对机器学习模型面临的领域偏移导致性能下降问题,本文提出一种两步有监督领域自适应方法,通过类别相关变换和嵌入相似度选择实现域不变表示,在多类时间序列数据集上验证了有效性。

摘要:

当机器学习模型被应用于与初始训练数据领域相似但存在差异的数据时,其性能会出现下降。为缓解这一领域偏移问题,领域自适应(DA)技术旨在寻找一种最优变换,将源域的(当前)输入数据转换到目标域,从而学习到域不变表示以降低域间差异。本文提出了一种新颖的有监督DA方法,该方法分为两个步骤:第一步,基于少量样本寻找从源域到目标域的最优类别相关变换,我们采用了最优传输方法,包括推土机距离(earth mover's distance)、Sinkhorn传输以及相关对齐方法;第二步,在推理阶段使用嵌入相似度技术选择对应的变换,采用相关度量和高阶矩匹配技术。我们在存在领域偏移的时间序列数据集上开展了全面评估,涵盖模拟数据集和多种在线手写数据集,以验证该方法的性能。

英文摘要:

The performance of a machine learning model degrades when it is applied to data from a similar but different domain than the data it has initially been trained on. To mitigate this domain shift problem, domain adaptation (DA) techniques search for an optimal transformation that converts the (current) input data from a source domain to a target domain to learn a domain-invariant representation that reduces domain discrepancy. This paper proposes a novel supervised DA based on two steps. First, we search for an optimal class-dependent transformation from the source to the target domain from a few samples. We consider optimal transport methods such as the earth mover's distance, Sinkhorn transport and correlation alignment. Second, we use embedding similarity techniques to select the corresponding transformation at inference. We use correlation metrics and higher-order moment matching techniques. We conduct an extensive evaluation on time-series datasets with domain shift including simulated and various online handwriting datasets to demonstrate the performance.

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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