Learning dynamical systems from data: a simple cross-validation perspective, part I: parametric kernel flows

B Hamzi, H Owhadi - Physica D: Nonlinear Phenomena, 2021 - Elsevier
Regressing the vector field of a dynamical system from a finite number of observed states is
a natural way to learn surrogate models for such systems. We present variants of cross …

Infinite-dimensional reservoir computing

L Gonon, L Grigoryeva, JP Ortega - Neural Networks, 2024 - Elsevier
Reservoir computing approximation and generalization bounds are proved for a new
concept class of input/output systems that extends the so-called generalized Barron …

One-shot learning of stochastic differential equations with data adapted kernels

M Darcy, B Hamzi, G Livieri, H Owhadi… - Physica D: Nonlinear …, 2023 - Elsevier
We consider the problem of learning Stochastic Differential Equations of the form d X t= f (X
t) d t+ σ (X t) d W t from one sample trajectory. This problem is more challenging than …

[HTML][HTML] Learning dynamical systems from data: A simple cross-validation perspective, part iv: case with partial observations

B Hamzi, H Owhadi, Y Kevrekidis - Physica D: Nonlinear Phenomena, 2023 - Elsevier
A simple and interpretable way to learn a dynamical system from data is to interpolate its
governing equations with a kernel. In particular, this strategy is highly efficient (both in terms …

[PDF][PDF] Learning dynamical systems from data: a simple cross-validation perspective, part ii: nonparametric kernel flows

M Darcy, B Hamzi, J Susiluoto, A Braverman… - …, 2021 - users.cms.caltech.edu
In previous work, we showed that learning dynamical system [21] with kernel methods can
achieve state of the art, both in terms of accuracy and complexity, for predicting …

Learning dynamical systems from data: A simple cross-validation perspective, part v: Sparse kernel flows for 132 chaotic dynamical systems

L Yang, X Sun, B Hamzi, H Owhadi, N Xie - arXiv preprint arXiv …, 2023 - arxiv.org
Regressing the vector field of a dynamical system from a finite number of observed states is
a natural way to learn surrogate models for such systems. A simple and interpretable way to …

Kernel-based models for system analysis

HJ Van Waarde, R Sepulchre - IEEE Transactions on Automatic …, 2022 - ieeexplore.ieee.org
This article introduces a computational framework to identify nonlinear input–output
operators that fit a set of system trajectories while satisfying incremental integral quadratic …

Approximation of Lyapunov functions from noisy data

P Giesl, B Hamzi, M Rasmussen… - arXiv preprint arXiv …, 2016 - arxiv.org
Methods have previously been developed for the approximation of Lyapunov functions
using radial basis functions. However these methods assume that the evolution equations …

Kernel methods for center manifold approximation and a weak data-based version of the center manifold theorem

B Haasdonk, B Hamzi, G Santin, D Wittwar - Physica D: Nonlinear …, 2021 - Elsevier
For dynamical systems with a non hyperbolic equilibrium, it is possible to significantly
simplify the study of stability by means of the center manifold theory. This theory allows to …

Kernel methods for the approximation of nonlinear systems

J Bouvrie, B Hamzi - SIAM Journal on Control and Optimization, 2017 - SIAM
We introduce a data-driven model approximation method for nonlinear control systems,
drawing on recent progress in machine learning and statistical-dimensionality reduction …