Differentiable Gaussianization Layers for Inverse Problems Regularized by Deep Generative Models

• URL: http://arxiv.org/abs/2112.03860v4
• Date: Fri, 5 May 2023 02:20:43 GMT
• Title: Differentiable Gaussianization Layers for Inverse Problems Regularized by Deep Generative Models
• Authors: Dongzhuo Li
• Abstract summary: We show that latent tensors of deep generative models can fall out of the desired high-dimensional standard Gaussian distribution during inversion. Our approach achieves state-of-the-art performance in terms of accuracy and consistency.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Deep generative models such as GANs, normalizing flows, and diffusion models are powerful regularizers for inverse problems. They exhibit great potential for helping reduce ill-posedness and attain high-quality results. However, the latent tensors of such deep generative models can fall out of the desired high-dimensional standard Gaussian distribution during inversion, particularly in the presence of data noise and inaccurate forward models, leading to low-fidelity solutions. To address this issue, we propose to reparameterize and Gaussianize the latent tensors using novel differentiable data-dependent layers wherein custom operators are defined by solving optimization problems. These proposed layers constrain inverse problems to obtain high-fidelity in-distribution solutions. We validate our technique on three inversion tasks: compressive-sensing MRI, image deblurring, and eikonal tomography (a nonlinear PDE-constrained inverse problem) using two representative deep generative models: StyleGAN2 and Glow. Our approach achieves state-of-the-art performance in terms of accuracy and consistency.

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