Copula Transformations for Data-Consistent Inversion

2026-09-02

AI Summary

该研究通过Copula理论解决了iDCI与原始联合DCI解之间的关系问题，提出了一种基于Copula变换的方法来改进iDCI算法的准确性。

Abstract

Data-consistent inversion (DCI) constructs probability measures whose push-forward distributions agree with observed data, while iterative data-consistent inversion (iDCI) extends this framework to generalized stochastic inverse problems by enforcing multiple push-forward constraints sequentially. Although iDCI avoids the direct approximation of high-dimensional joint densities, its relationship to the original joint DCI solution has remained unclear. In this work, we establish this relationship through copula theory. Using Sklar's theorem, we derive a factorization of the DCI update into separate marginal and dependence transformations and show that the discrepancy remaining after convergence of the iDCI algorithm is entirely characterized by the copulas associated with the observed and predicted joint distributions. This characterization motivates a copula-transformed iDCI solution, and we prove that an exact copula transformation recovers the original DCI solution. We further establish convergence results for approximate copula transformations under converging sequences of reference measures and progressively enriched feasible sets. Numerical examples demonstrate how the geometry induced by the quantity-of-interest map governs the importance of the copula transformation, illustrate an adaptive reference-measure refinement strategy for improving computational accuracy under a fixed sampling budget, and demonstrate the progressive refinement of generalized stochastic inverse problems through heterogeneous, asynchronously acquired experiments.

Problem

• Data-Consistent Inversion
• Iterative Data-Consistent Inversion
• Copula Theory
• Sklar's Theorem
• Joint Distributions

Innovation

• Copula Transformations
• Data-Consistent Inversion (DCI)
• Iterative Data-Consistent Inversion (iDCI)
• Sklar's Theorem