Score Jacobian Chaining: Lifting Pretrained 2D Diffusion Models for 3D Generation

• URL: http://arxiv.org/abs/2212.00774v1
• Date: Thu, 1 Dec 2022 18:56:37 GMT
• Title: Score Jacobian Chaining: Lifting Pretrained 2D Diffusion Models for 3D Generation
• Authors: Haochen Wang, Xiaodan Du, Jiahao Li, Raymond A. Yeh, Greg Shakhnarovich
• Abstract summary: A diffusion model learns to predict a vector field of gradients. We propose a chain rule on the learned gradients, and back-propagate the score of a diffusion model through the Jacobian of a differentiable field. We run our algorithm on several off-the-shelf diffusion image generative models, including the recently released Stable Diffusion trained on the large-scale LAION dataset.
• Score: 28.25023686484727
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A diffusion model learns to predict a vector field of gradients. We propose to apply chain rule on the learned gradients, and back-propagate the score of a diffusion model through the Jacobian of a differentiable renderer, which we instantiate to be a voxel radiance field. This setup aggregates 2D scores at multiple camera viewpoints into a 3D score, and repurposes a pretrained 2D model for 3D data generation. We identify a technical challenge of distribution mismatch that arises in this application, and propose a novel estimation mechanism to resolve it. We run our algorithm on several off-the-shelf diffusion image generative models, including the recently released Stable Diffusion trained on the large-scale LAION dataset.

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