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Deep learning for universal linear embeddings of nonlinear dynamics

Open access
Lusch, Bethany, Kutz, J. Nathan, Brunton, Steven L.·2018·Nature Communications

Abstract

Identifying coordinate transformations that make strongly nonlinear dynamics approximately linear has the potential to enable nonlinear prediction, estimation, and control using linear theory. The Koopman operator is a leading data-driven embedding, and its eigenfunctions provide intrinsic coordinates that globally linearize the dynamics. However, identifying and representing these eigenfunctions has proven challenging. This work leverages deep learning to discover representations of Koopman eigenfunctions from data. Our network is parsimonious and interpretable by construction, embedding the dynamics on a low-dimensional manifold. We identify nonlinear coordinates on which the dynamics are globally linear using a modified auto-encoder. We also generalize Koopman representations to include a ubiquitous class of systems with continuous spectra. Our framework parametrizes the continuous frequency using an auxiliary network, enabling a compact and efficient embedding, while connecting our models to decades of asymptotics. Thus, we benefit from the power of deep learning, while retaining the physical interpretability of Koopman embeddings.

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Metadata

Authors
Lusch, B., Kutz, J. N., & Brunton, S. L.
Venue
Nature Communications
Published
2018-11-23
Volume
9
Issue
1
Pages
4950-4950
ISSN
2041-1723 (ISSN-L)
OpenAlex
W2777417212
Cited by
1,424
References
12
FWCI
48.45
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Deep learning for universal linear embeddings of nonlinear dynamics. https://app.cochat.ai/papers/10.1038/s41467-018-07210-0
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Lusch, B., Kutz, J. N., & Brunton, S. L. (2018). Deep learning for universal linear embeddings of nonlinear dynamics. Nature Communications. https://doi.org/10.1038/s41467-018-07210-0

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