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A Test-Time Learning Approach to Reparameterize the Geophysical Inverse Problem with a Convolutional Neural Network by Xu, Anran; Heagy, Lindsey J. is a scholarly article available to read on EtoBox.

What is A Test-Time Learning Approach to Reparameterize the Geophysical Inverse Problem with a Convolutional Neural Network about?

Regularization is critical for solving ill-posed geophysical inverse problems. Explicit regularization is often used, but there are opportunities to explore the implicit regularization effects that are inherent in a Neural Network structure. Researchers have discovered that the Convolutional Neural Network (CNN) architecture inherently enforces a regularization that is advantageous for addressing diverse inverse problems in computer vision, including de-noising and in-painting. In this study, we examine the applicability of this implicit regularization to geophysical inversions. The CNN maps an arbitrary vector to the model space. The predicted subsurface model is then fed into a forward numerical simulation to generate corresponding predicted measurements. Subsequently, the objective function value is computed by comparing these predicted measurements with the observed measurements. The backpropagation algorithm is employed to update the trainable parameters of the CNN during the inversion. Note that the CNN in our proposed method does not require training before the inversion, rather, the CNN weights are estimated in the inversion process, hence this is a test-time learning (TTL)

Author

Xu, Anran; Heagy, Lindsey J.

Published

2023

Language

EN