Randomized physics-informed machine learning for uncertainty quantification in high-dimensional inverse problems
Journal Article
·
· Journal of Computational Physics
- University of Illinois at Urbana-Champaign, IL (United States)
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- University of Illinois at Urbana-Champaign, IL (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
We propose the randomized physics-informed conditional Karhunen-Loève expansion (rPICKLE) method for uncertainty quantification in high-dimensional inverse problems. In rPICKLE, the states and parameters of the governing partial differential equation (PDE) are approximated via truncated conditional Karhunen-Loève expansions (cKLEs). Uncertainty in the inverse solution is quantified via the posterior distribution of cKLE coefficients formulated with independent standard normal priors and a likelihood containing PDE residuals evaluated over the computational domain. The maximum a posteriori (MAP) estimate of the cKLE coefficients is found by minimizing a loss function given (up to a constant) by the negative log posterior. The posterior is sampled by adding zero-mean Gaussian noises into the MAP loss function and minimizing the loss for different noise realizations. For linear and low-dimensional nonlinear problems, we show that the rPICKLE posterior converges to the true Bayesian posterior. For high-dimensional non-linear problems, we obtain rPICKLE posterior approximations with high log-predictive probability. For a low-dimensional problem, the traditional Hamiltonian Monte Carlo (HMC) and Stein Variational Gradient Descent (SVGD) methods yield similar (to rPICKLE) posteriors. However, both HMC and SVGD fail for the high-dimensional problem. These results demonstrate the advantages of rPICKLE for approximately sampling high-dimensional posterior distributions.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2440115
- Alternate ID(s):
- OSTI ID: 2485356
- Report Number(s):
- PNNL-SA--203615
- Journal Information:
- Journal of Computational Physics, Journal Name: Journal of Computational Physics Vol. 519; ISSN 0021-9991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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