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Title: Likelihood-informed dimension reduction for nonlinear inverse problems

Journal Article · · Inverse Problems
 [1];  [2];  [1];  [3];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Aeronautics and Astronautics
  2. Univ. of Texas, Austin, TX (United States). Inst. for Computational Engineering and Sciences
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Aeronautics and Astronautics; Lappeenranta Univ. of Technology, Lappeenranta (Finland)

The intrinsic dimensionality of an inverse problem is affected by prior information, the accuracy and number of observations, and the smoothing properties of the forward operator. From a Bayesian perspective, changes from the prior to the posterior may, in many problems, be confined to a relatively low-dimensional subspace of the parameter space. We present a dimension reduction approach that defines and identifies such a subspace, called the 'likelihood-informed subspace' (LIS), by characterizing the relative influences of the prior and the likelihood over the support of the posterior distribution. This identification enables new and more efficient computational methods for Bayesian inference with nonlinear forward models and Gaussian priors. In particular, we approximate the posterior distribution as the product of a lower-dimensional posterior defined on the LIS and the prior distribution marginalized onto the complementary subspace. Markov chain Monte Carlo sampling can then proceed in lower dimensions, with significant gains in computational efficiency. We also introduce a Rao–Blackwellization strategy that de-randomizes Monte Carlo estimates of posterior expectations for additional variance reduction. We demonstrate the efficiency of our methods using two numerical examples: inference of permeability in a groundwater system governed by an elliptic PDE, and an atmospheric remote sensing problem based on Global Ozone Monitoring System (GOMOS) observations.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Grant/Contract Number:
SC0003908
OSTI ID:
1557619
Journal Information:
Inverse Problems, Vol. 30, Issue 11; ISSN 0266-5611
Publisher:
IOPscienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 78 works
Citation information provided by
Web of Science

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Cited By (14)

Retrieval of atmospheric CH 4 profiles from Fourier transform infrared data using dimension reduction and MCMC: RETRIEVAL OF FTIR CH 4 PROFILES journal September 2016
Randomized Truncated SVD Levenberg‐Marquardt Approach to Geothermal Natural State and History Matching journal March 2018
Inverse problems: From regularization to Bayesian inference journal January 2018
Sampling via Measure Transport: An Introduction book January 2016
Spatial Localization for Nonlinear Dynamical Stochastic Models for Excitable Media journal November 2019
Scaling limits in computational Bayesian inversion journal October 2016
Accelerated MCMC for Satellite-Based Measurements of Atmospheric CO2 journal September 2019
Top-down constraints on global N2O emissions at optimal resolution: application of a new dimension reduction technique journal January 2018
Sampling via Measure Transport: An Introduction book June 2017
Scaling Limits in Computational Bayesian Inversion text January 2014
Randomized Truncated SVD Levenberg-Marquardt Approach to Geothermal Natural State and History Matching text January 2017
Spatial localization for nonlinear dynamical stochastic models for excitable media preprint January 2019
Fast Kalman Filter using Hierarchical-matrices and low-rank perturbative approach text January 2014
A randomized maximum a posterior method for posterior sampling of high dimensional nonlinear Bayesian inverse problems preprint January 2016

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