Discovering ordinary differential equations that govern time-seriesDownload PDF

Published: 21 Oct 2022, Last Modified: 01 Oct 2023AI4Science PosterReaders: Everyone
Keywords: Symbolic, ODE, Transformer
TL;DR: Given a time series that is governed by an ordinary differential equation (ODE), our model infers the mathematical expression of the ODE.
Abstract: Natural laws are often described through differential equations yet finding a differential equation that describes the governing law underlying observed data is a challenging and still mostly manual task. In this paper we make a step towards the automation of this process: we propose a transformer-based sequence-to-sequence model that recovers scalar autonomous ordinary differential equations (ODEs) in symbolic form from time-series data of a single observed solution of the ODE. Our method is efficiently scalable: after one-time pretraining on a large set of ODEs, we can infer the governing laws of a new observed solution in a few forward passes of the model. Then we show that our model performs better or on par with existing methods in various test cases in terms of accurate symbolic recovery of the ODE, especially for more complex expressions.
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