Gianluca Fabiani

Gianluca Fabiani

Postdoctoral Fellow at the Hopkins Extreme Materials Institute (HEMI)

Publications

You can also find my articles on my Google Scholar profile.

Enabling Local Neural Operators to perform Equation-Free System-Level Analysis

Published in Nature Machine Intelligence, 2026

We propose a framework that integrates Neural Operators (NOs) with Krylov subspace iterative methods for efficient stability and bifurcation analysis of large-scale dynamical systems, extending NO applications beyond temporal predictions to system-level numerical tasks

Recommended citation: Fabiani, G., Vandecasteele, H., Goswami, S., Siettos, C., & Kevrekidis, I. G., Enabling Local Neural Operators to perform Equation-Free System-Level Analysis, Nat Mach Intell 8, 2026 https://arxiv.org/abs/2505.02308

Equation-Free Coarse Control of Distributed Parameter Systems via Local Neural Operators

Published in Proc. American Control Conference (ACC), IEEE, 2026

We propose a framework, using data-driven local neural operators within Krylov subspace methods, to enable efficient model reduction and feedback control of high-dimensional systems without explicit coarse equations.

Recommended citation: Fabiani, G., Siettos, C., & Kevrekidis, I. G. (2026). Equation-Free Coarse Control of Distributed Parameter Systems via Local Neural Operators. Proc. American Control Conference (ACC), IEEE https://www.arxiv.org/abs/2509.23975

Random Projection Neural Networks of Best Approximation: Convergence theory and practical applications

Published in SIAM Journal on Mathematics of Data Science, Vol. 7, Iss. 2, 2025

This preprint is about the existence, uniqueness and exponential convergence of RPNN of best approximation.

Recommended citation: Fabiani, G. (2025). Random Projection Neural Networks of Best Approximation: Convergence theory and practical applications. SIAM Journal on Mathematics of Data Science 7(2), 2025. https://epubs.siam.org/doi/abs/10.1137/24M1639890?af=R

RandONets: Shallow-Networks with Random Projections for learning linear and nonlinear operators

Published in Journal of Computational Physics, 2024

This paper propose a novel architecture, RandONets, for learning generic Operators. It leverages Random Projections and Nonlinear Random Features, as well as tailor-made numerical analysis method for improving significantly efficiency and accuracy. We demonstrate that RandONets outperforms DeepONets by 10 order of magnitudes. Also, we theoretically prove and extend the theorem of Chen and Chen (1995) to such randomized architectures.

Recommended citation: Fabiani, G., Kevrekidis, I. G., Siettos, C., & Yannacopoulos, A. N. RandONets: Shallow-Networks with Random Projections for learning linear and nonlinear operators. J Comp Phys (2025) https://doi.org/10.1016/j.jcp.2024.113433

On the accuracy of interpolation based on single-layer artificial neural networks with a focus on defeating the Runge phenomenon

Published in Soft Computing, 2024

This paper is about the interpolation accuracy of Random featured Neural Networks, with particular focus on the possibility to use random grids, even for functions presenting the Runge-Phenomenon.

Recommended citation: Auricchio, F., Belardo, M. R., Calabrò, F., Fabiani, G. & Pascaner, A. F. (2024). On the accuracy of interpolation based on single-layer artificial neural networks. Soft Computing https://doi.org/10.1007/s00500-024-09918-2

Slow invariant manifolds of singularly perturbed systems via physics-informed machine learning

Published in SIAM Journal on Scientific Computing 46(4), 2024

This paper is about the solution of invariance equation associated with SIM via PINNs

Recommended citation: Patsatzis, D. G., Fabiani, G., Russo, L., & Siettos, C. (2024). Slow invariant manifolds of singularly perturbed systems via physics-informed machine learning. SIAM Journal on Scientific Computing 46(4) https://doi.org/10.1137/23M1602991

Task-oriented machine learning surrogates for tipping points of agent-based models

Published in Nature Communications 15, 2024

This paper is about the multiscale inverse problem of High-dimensional Agent based models via FNNs and RPNNs. For the data-driven reconstruction of bifurcation diagrams and rare event analysis. We learn both Integro-PDEs and low-dimensional SDEs (ML surrogates.)

Recommended citation: Fabiani, G., Evangelou, N., Cui, T. et al. Task-oriented machine learning surrogates for tipping points of agent-based models. Nat Commun 15, 4117 (2024). https://doi.org/10.1038/s41467-024-48024-7 https://doi.org/10.1038/s41467-024-48024-7

Tipping points in overturning circulation mediated by ocean mixing and the configuration and magnitude of the hydrological cycle: A simple model

Published in Journal of Physical Oceanography, 2024

This paper is about the description and bifurcation analysis of a simple 6-box model for the AMOC

Recommended citation: Gnanadesikan, A., Fabiani, G., Liu, J., Gelderloos, R., Brett, G. J., Kevrekidis, Y., ... & Sleeman, J. (2023). Tipping points in overturning circulation mediated by ocean mixing and the configuration and magnitude of the hydrological cycle: A simple model. Journal of Physical Oceanography. https://doi.org/10.1175/JPO-D-23-0161.1

Discrete-time nonlinear feedback linearization via physics-informed machine learning

Published in Journal of Computational Physics Volume 492, 112408, 2023

This paper is about the one-step feedback linearization and control via PINNs

Recommended citation: Hector Vargas Alvarez, Gianluca Fabiani, Nikolaos Kazantzis, Constantinos Siettos, Ioannis G. Kevrekidis, Discrete-time nonlinear feedback linearization via physics-informed machine learning, Journal of Computational Physics, Volume 492, 2023, 112408, ISSN 0021-9991, https://doi.org/10.1016/j.jcp.2023.112408. https://www.sciencedirect.com/science/article/pii/S002199912300503X

Parsimonious physics-informed random projection neural networks for initial value problems of ODEs and index-1 DAEs

Published in Chaos: An Interdisciplinary Journal of Nonlinear Science, 33(4), 2023

This paper was awarded with an Editor’s Pick badge. It is about the solution of stiff system of ODEs and DAEs (including PDEs) via time-adaptive Random Projection Neural Networks.

Recommended citation: Fabiani, G., Galaris, E., Russo, L., & Siettos, C. (2023). Parsimonious physics-informed random projection neural networks for initial value problems of ODEs and index-1 DAEs. Chaos: An Interdisciplinary Journal of Nonlinear Science, 33(4). https://pubs.aip.org/aip/cha/article-abstract/33/4/043128/2878586/Parsimonious-physics-informed-random-projection?redirectedFrom=fulltext

Numerical bifurcation analysis of pdes from lattice Boltzmann model simulations: a parsimonious machine learning approach

Published in Journal of Scientific Computing, 92(2), 34, 2022

This paper is about the solution of the inverse problem for parametric PDEs ( system identification) and data-driven construction of bifurcation diagram

Recommended citation: Galaris, E., Fabiani, G., Gallos, I., Kevrekidis, I., & Siettos, C. (2022). Numerical bifurcation analysis of pdes from lattice Boltzmann model simulations: a parsimonious machine learning approach. Journal of Scientific Computing, 92(2), 34. https://link.springer.com/article/10.1007/s10915-021-01650-5

Numerical Solution and Bifurcation Analysis of nonlinear partial differential equations with extreme learning machines

Published in Journal of Scientific Computing - Springer, 2021

This paper is about the efficient solution of steady state PDE problem via Machine Learning

Recommended citation: Fabiani, G., Calabrò, F., Russo, L., & Siettos, C. (2021). Numerical solution and bifurcation analysis of nonlinear partial differential equations with extreme learning machines. Journal of Scientific Computing, 89, 1-35. https://link.springer.com/article/10.1007/s10915-021-01650-5

Extreme learning machine collocation for the numerical solution of elliptic PDEs with sharp gradients

Published in Computer Methods in Applied Mechanics and Engineering 387, 114188, 2021

This paper is about the solution of linear stationary PDEs with Random Projection Neural Networks

Recommended citation: Calabrò, F., Fabiani, G., & Siettos, C. (2021). Extreme learning machine collocation for the numerical solution of elliptic PDEs with sharp gradients. Computer Methods in Applied Mechanics and Engineering, 387, 114188. https://doi.org/10.1016/j.cma.2021.114188