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Regression-Based Projection for Learning Mori–Zwanzig Operators

Journal Article · · SIAM Journal on Applied Dynamical Systems
DOI:https://doi.org/10.1137/22m1506146· OSTI ID:2203394

We propose to adopt statistical regression as the projection operator to enable data-driven learning of the operators in the Mori–Zwanzig formalism. We present a principled method to extract the Markov and memory operators for any regression models. We show that the choice of linear regression results in a recently proposed data-driven learning algorithm based on Mori’s projection operator, which is a higher-order approximate Koopman learning method. We show that more expressive nonlinear regression models naturally fill in the gap between the highly idealized and computationally efficient Mori’s projection operator and the most optimal yet computationally infeasible Zwanzig’s projection operator. We performed numerical experiments and extracted the operators for an array of regression-based projections, including linear, polynomial, spline, and neural network–based regressions, showing a progressive improvement as the complexity of the regression model increased. In conclusion, our proposition provides a general framework to extract memory-dependent corrections and can be readily applied to an array of data-driven learning methods for stationary dynamical systems in the literature.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2203394
Alternate ID(s):
OSTI ID: 2202613
OSTI ID: 2202615
Report Number(s):
LA-UR--22-24323
Journal Information:
SIAM Journal on Applied Dynamical Systems, Journal Name: SIAM Journal on Applied Dynamical Systems Journal Issue: 4 Vol. 22; ISSN 1536-0040
Publisher:
Society for Industrial and Applied Mathematics (SIAM)Copyright Statement
Country of Publication:
United States
Language:
English

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