Search Results for author: Andrew Stuart

Found 10 papers, 7 papers with code

Using Uncertainty Quantification to Characterize and Improve Out-of-Domain Learning for PDEs

1 code implementation15 Mar 2024 S. Chandra Mouli, Danielle C. Maddix, Shima Alizadeh, Gaurav Gupta, Andrew Stuart, Michael W. Mahoney, Yuyang Wang

Existing work in scientific machine learning (SciML) has shown that data-driven learning of solution operators can provide a fast approximate alternative to classical numerical partial differential equation (PDE) solvers.

Uncertainty Quantification

Learning About Structural Errors in Models of Complex Dynamical Systems

1 code implementation29 Dec 2023 Jin-Long Wu, Matthew E. Levine, Tapio Schneider, Andrew Stuart

Complex dynamical systems are notoriously difficult to model because some degrees of freedom (e. g., small scales) may be computationally unresolvable or are incompletely understood, yet they are dynamically important.

Introduction To Gaussian Process Regression In Bayesian Inverse Problems, With New ResultsOn Experimental Design For Weighted Error Measures

no code implementations9 Feb 2023 Tapio Helin, Andrew Stuart, Aretha Teckentrup, Konstantinos Zygalakis

Bayesian posterior distributions arising in modern applications, including inverse problems in partial differential equation models in tomography and subsurface flow, are often computationally intractable due to the large computational cost of evaluating the data likelihood.

Experimental Design regression

Neural Operator: Learning Maps Between Function Spaces

1 code implementation19 Aug 2021 Nikola Kovachki, Zongyi Li, Burigede Liu, Kamyar Azizzadenesheli, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

The classical development of neural networks has primarily focused on learning mappings between finite dimensional Euclidean spaces or finite sets.

Operator learning

Learning Dissipative Dynamics in Chaotic Systems

2 code implementations13 Jun 2021 Zongyi Li, Miguel Liu-Schiaffini, Nikola Kovachki, Burigede Liu, Kamyar Azizzadenesheli, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

Chaotic systems are notoriously challenging to predict because of their sensitivity to perturbations and errors due to time stepping.

Multipole Graph Neural Operator for Parametric Partial Differential Equations

4 code implementations NeurIPS 2020 Zongyi Li, Nikola Kovachki, Kamyar Azizzadenesheli, Burigede Liu, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

One of the main challenges in using deep learning-based methods for simulating physical systems and solving partial differential equations (PDEs) is formulating physics-based data in the desired structure for neural networks.

Kernel Analog Forecasting: Multiscale Test Problems

no code implementations13 May 2020 Dmitry Burov, Dimitrios Giannakis, Krithika Manohar, Andrew Stuart

The nature of the predictions made, and the manner in which they should be interpreted, depends crucially on the extent to which the variables chosen for prediction are Markovian, or approximately Markovian.

Neural Operator: Graph Kernel Network for Partial Differential Equations

6 code implementations ICLR Workshop DeepDiffEq 2019 Zongyi Li, Nikola Kovachki, Kamyar Azizzadenesheli, Burigede Liu, Kaushik Bhattacharya, Andrew Stuart, Anima Anandkumar

The classical development of neural networks has been primarily for mappings between a finite-dimensional Euclidean space and a set of classes, or between two finite-dimensional Euclidean spaces.

Earth System Modeling 2.0: A Blueprint for Models That Learn From Observations and Targeted High-Resolution Simulations

no code implementations31 Aug 2017 Tapio Schneider, Shiwei Lan, Andrew Stuart, João Teixeira

Climate projections continue to be marred by large uncertainties, which originate in processes that need to be parameterized, such as clouds, convection, and ecosystems.

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