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Sequential multi-dimensional self-supervised learning for clinical time series

Self-supervised learning (SSL) for clinical time series data has received significant attention in recent literature, since these data are highly rich and provide important information about a patient’s physiological state. However, most existing SSL methods for clinical time series are limited in that they are designed for unimodal time series, such as a sequence of structured features (e.g., lab values and vitals signs) or an individual high-dimensional physiological signal (e.g., an electrocardiogram). These existing methods cannot be readily extended to model time series that exhibit multimodality, with structured features and high-dimensional data being recorded at each time step in the sequence. In this work, we address this gap and propose a new SSL method — Sequential Multi-Dimensional SSL — where a SSL loss is applied both at the level of the entire sequence and at the level of the individual high-dimensional data points in the sequence in order to better capture information at both scales.

Details

author(s)
Collin Stultz
publication date
1 January 2023
source
Proceedings of Machine Learning Research
related programme
MIT Jameel Clinic
Link to publication
External link ->

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