Search Results for author: Daniele E. Schiavazzi

Found 10 papers, 8 papers with code

InVAErt networks: a data-driven framework for model synthesis and identifiability analysis

1 code implementation24 Jul 2023 Guoxiang Grayson Tong, Carlos A. Sing Long, Daniele E. Schiavazzi

Use of generative models and deep learning for physics-based systems is currently dominated by the task of emulation.

LINFA: a Python library for variational inference with normalizing flow and annealing

1 code implementation10 Jul 2023 Yu Wang, Emma R. Cobian, Jubilee Lee, Fang Liu, Jonathan D. Hauenstein, Daniele E. Schiavazzi

Variational inference is an increasingly popular method in statistics and machine learning for approximating probability distributions.

Variational Inference

Differentially Private Normalizing Flows for Density Estimation, Data Synthesis, and Variational Inference with Application to Electronic Health Records

1 code implementation11 Feb 2023 Bingyue Su, Yu Wang, Daniele E. Schiavazzi, Fang Liu

We use normalizing flows (NF), a family of deep generative models, to estimate the probability density of a dataset with differential privacy (DP) guarantees, from which privacy-preserving synthetic data are generated.

Density Estimation Privacy Preserving +1

Data-driven synchronization-avoiding algorithms in the explicit distributed structural analysis of soft tissue

1 code implementation5 Jul 2022 Guoxiang Grayson Tong, Daniele E. Schiavazzi

We propose a data-driven framework to increase the computational efficiency of the explicit finite element method in the structural analysis of soft tissue.

Computational Efficiency

Multifidelity data fusion in convolutional encoder/decoder networks

no code implementations10 May 2022 Lauren Partin, Gianluca Geraci, Ahmad Rushdi, Michael S. Eldred, Daniele E. Schiavazzi

We analyze the regression accuracy of convolutional neural networks assembled from encoders, decoders and skip connections and trained with multifidelity data.

regression

AdaAnn: Adaptive Annealing Scheduler for Probability Density Approximation

1 code implementation1 Feb 2022 Emma R. Cobian, Jonathan D. Hauenstein, Fang Liu, Daniele E. Schiavazzi

We demonstrate the computational efficiency of the AdaAnn scheduler for variational inference with normalizing flows on a number of examples, including density approximation and parameter estimation for dynamical systems.

Computational Efficiency Variational Inference

An analysis of reconstruction noise from undersampled 4D flow MRI

1 code implementation11 Jan 2022 Lauren Partin, Daniele E. Schiavazzi, Carlos A. Sing Long

Novel Magnetic Resonance (MR) imaging modalities can quantify hemodynamics but require long acquisition times, precluding its widespread use for early diagnosis of cardiovascular disease.

Variational Inference with NoFAS: Normalizing Flow with Adaptive Surrogate for Computationally Expensive Models

1 code implementation28 Aug 2021 Yu Wang, Fang Liu, Daniele E. Schiavazzi

To reduce the computational cost without sacrificing inferential accuracy, we propose Normalizing Flow with Adaptive Surrogate (NoFAS), an optimization strategy that alternatively updates the normalizing flow parameters and surrogate model parameters.

Bayesian Inference Variational Inference

An ensemble solver for segregated cardiovascular FSI

1 code implementation22 Jan 2021 Xue Li, Daniele E. Schiavazzi

Computational models are increasingly used for diagnosis and treatment of cardiovascular disease.

Computational Engineering, Finance, and Science Numerical Analysis Numerical Analysis

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