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From Displacements to Distributions: A Machine-Learning Framework for Uncertainty Quantification in Computational Models


Core Concepts
The author presents a novel framework combining two methods to quantify uncertainties in engineered systems, focusing on aleatoric and epistemic sources. The approach involves machine learning to transform noisy datasets into distributions for data-consistent inversion.
Abstract
The content introduces a framework that combines two methods for quantifying uncertainties in computational models. It discusses the challenges of specifying Quantity of Interest (QoI) maps and presents a machine-learning-enabled process to address these challenges. The LUQ framework is detailed, emphasizing the steps involved in transforming noisy datasets into distributions for data-consistent inversion. The mathematical and algorithmic contributions are highlighted, along with numerical examples illustrating the application of the framework. The work emphasizes the importance of filtering noisy data, learning uncertain quantities through feature extraction, and computing Data-Consistent Inversion (DCI) solutions. It extends the LUQ framework to handle spatial and spatio-temporal data using deep learning techniques. The use of neural networks and radial basis functions for filtering is discussed, providing insights into optimizing NNs for accurate approximation of underlying signals. Key points include: Introduction of a novel framework combining two methods for uncertainty quantification. Detailed explanation of the Learning Uncertain Quantities (LUQ) framework. Mathematical and algorithmic contributions encoded within an open-source software package. Illustrative numerical examples showcasing the application of the framework. Extension of LUQ to handle spatial and spatio-temporal data using deep learning techniques.
Stats
"2000 MSC: 28A50, 60-04, 60-08"
Quotes

Key Insights Distilled From

by Taylor Roper... at arxiv.org 03-07-2024

https://arxiv.org/pdf/2403.03233.pdf
From Displacements to Distributions

Deeper Inquiries

How does the integration of machine learning enhance traditional methods in uncertainty quantification

The integration of machine learning techniques enhances traditional methods in uncertainty quantification by providing more flexibility, adaptability, and accuracy in handling complex data sets. Machine learning algorithms can effectively learn patterns and relationships within the data, allowing for improved modeling of uncertainties. In the context provided, the LUQ framework leverages machine learning to filter noisy datasets and learn quantities of interest (QoI) maps from spatio-temporal data. This enables a more robust analysis of uncertainties in computational models by transforming noisy datasets into distributions that can be used for Data-Consistent Inversion (DCI). By utilizing machine learning algorithms such as neural networks and kernel-based methods, LUQ is able to extract meaningful information from noisy data and improve the accuracy of parameter estimation.

What are the implications of utilizing neural networks and radial basis functions for filtering noisy data

Utilizing neural networks (NNs) and radial basis functions (RBFs) for filtering noisy data offers several advantages in uncertainty quantification. NNs provide a flexible framework for approximating complex functions with multiple hidden layers capable of capturing intricate patterns in the data. RBFs offer localized approximation capabilities based on Gaussian-type functions centered around specific points in the input space. When applied to filtering noisy data within the LUQ framework, NNs and RBFs enable efficient extraction of relevant features from spatial or spatio-temporal datasets while reducing noise interference. Neural networks allow for adaptive modeling of nonlinear relationships between parameters and observed quantities, enhancing the ability to capture intricate dynamics present in computational models. On the other hand, radial basis functions provide a localized representation that can effectively filter out noise while preserving essential information contained within spatial or temporal datasets. By incorporating NNs and RBFs into filtering processes within LUQ, researchers can achieve more accurate representations of underlying dynamics from noisy observational data while improving parameter estimation through enhanced feature extraction capabilities.

How can the LUQ framework be further extended to address more complex computational models

To further extend the LUQ framework for addressing more complex computational models, several enhancements can be considered: Incorporating Deep Learning Architectures: Integrating deep learning architectures like convolutional neural networks (CNNs) or recurrent neural networks (RNNs) could enhance feature extraction capabilities when dealing with high-dimensional spatial or spatio-temporal datasets. Adaptive Filtering Strategies: Developing adaptive filtering strategies that dynamically adjust model complexity based on dataset characteristics could improve efficiency and accuracy in extracting relevant information. Ensemble Methods: Implementing ensemble methods such as combining predictions from multiple filters or QoI maps could enhance robustness against noise variations and improve overall uncertainty quantification results. Bayesian Optimization Techniques: Utilizing Bayesian optimization techniques to optimize hyperparameters during training processes could lead to better convergence rates and improved performance across different types of computational models. By incorporating these advanced methodologies into the LUQ framework, researchers can address challenges posed by increasingly complex computational models while enhancing uncertainty quantification processes through sophisticated feature extraction mechanisms tailored to diverse types of spatial or spatio-temporal datasets.
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