Search Results for author: Karen Willcox

Found 10 papers, 6 papers with code

Learning High-Dimensional Parametric Maps via Reduced Basis Adaptive Residual Networks

2 code implementations14 Dec 2021 Thomas O'Leary-Roseberry, Xiaosong Du, Anirban Chaudhuri, Joaquim R. R. A. Martins, Karen Willcox, Omar Ghattas

We propose a scalable framework for the learning of high-dimensional parametric maps via adaptively constructed residual network (ResNet) maps between reduced bases of the inputs and outputs.

Experimental Design Vocal Bursts Intensity Prediction

Reduced operator inference for nonlinear partial differential equations

2 code implementations29 Jan 2021 Elizabeth Qian, Ionut-Gabriel Farcas, Karen Willcox

First, ideas from projection-based model reduction are used to explicitly parametrize the learned model by low-dimensional polynomial operators which reflect the known form of the governing PDE.

BIG-bench Machine Learning Dimensionality Reduction

Certifiable Risk-Based Engineering Design Optimization

no code implementations13 Jan 2021 Anirban Chaudhuri, Boris Kramer, Matthew Norton, Johannes O. Royset, Karen Willcox

CRiBDO is contrasted with reliability-based design optimization (RBDO), where uncertainties are accounted for via the probability of failure, through a structural and a thermal design problem.

Optimization and Control Computational Engineering, Finance, and Science Data Analysis, Statistics and Probability Computation

Data-driven reduced-order models via regularized operator inference for a single-injector combustion process

1 code implementation6 Aug 2020 Shane A. McQuarrie, Cheng Huang, Karen Willcox

With appropriate regularization and an informed selection of learning variables, the reduced-order models exhibit high accuracy in re-predicting the training regime and acceptable accuracy in predicting future dynamics, while achieving close to a million times speedup in computational cost.

Computational Engineering, Finance, and Science J.2

Operator inference for non-intrusive model reduction of systems with non-polynomial nonlinear terms

1 code implementation22 Feb 2020 Peter Benner, Pawan Goyal, Boris Kramer, Benjamin Peherstorfer, Karen Willcox

The proposed method learns operators for the linear and polynomially nonlinear dynamics via a least-squares problem, where the given non-polynomial terms are incorporated in the right-hand side.

Learning physics-based reduced-order models for a single-injector combustion process

2 code implementations9 Aug 2019 Renee Swischuk, Boris Kramer, Cheng Huang, Karen Willcox

The machine learning perspective brings the flexibility to use transformed physical variables to define the POD basis.

BIG-bench Machine Learning

Lookahead Bayesian Optimization with Inequality Constraints

no code implementations NeurIPS 2017 Remi Lam, Karen Willcox

We consider the task of optimizing an objective function subject to inequality constraints when both the objective and the constraints are expensive to evaluate.

Bayesian Optimization

Bayesian Optimization with a Finite Budget: An Approximate Dynamic Programming Approach

no code implementations NeurIPS 2016 Remi Lam, Karen Willcox, David H. Wolpert

We consider the problem of optimizing an expensive objective function when a finite budget of total evaluations is prescribed.

Bayesian Optimization

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