Representation Learning of Multivariate Time Series using Attention and Adversarial Training

• URL: http://arxiv.org/abs/2401.01987v1
• Date: Wed, 3 Jan 2024 21:32:46 GMT
• Title: Representation Learning of Multivariate Time Series using Attention and Adversarial Training
• Authors: Leon Scharw\"achter and Sebastian Otte
• Abstract summary: A Transformer-based autoencoder is proposed that is regularized using an adversarial training scheme to generate artificial time series signals. Our results indicate that the generated signals exhibit higher similarity to an exemplary dataset than using a convolutional network approach.
• Score: 2.0577627277681887
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A critical factor in trustworthy machine learning is to develop robust representations of the training data. Only under this guarantee methods are legitimate to artificially generate data, for example, to counteract imbalanced datasets or provide counterfactual explanations for blackbox decision-making systems. In recent years, Generative Adversarial Networks (GANs) have shown considerable results in forming stable representations and generating realistic data. While many applications focus on generating image data, less effort has been made in generating time series data, especially multivariate signals. In this work, a Transformer-based autoencoder is proposed that is regularized using an adversarial training scheme to generate artificial multivariate time series signals. The representation is evaluated using t-SNE visualizations, Dynamic Time Warping (DTW) and Entropy scores. Our results indicate that the generated signals exhibit higher similarity to an exemplary dataset than using a convolutional network approach.

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