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On the Curvature of Deep Generative Models

According to the manifold hypothesis, high-dimensional data, despite its apparent complexity, often adheres to a simpler underlying structure, typically represented as a manifold, or a lower-dimensional surface embedded within the larger dimensional space. Performing computations within these high-dimensional environments presents significant challenges. A practical approach is to parameterize the surface in $\mathcal{X}$ by a low-dimensional variable $\mathbf{z} \in \mathcal{Z}$ created with a suitable smooth generator function $f : \mathcal{Z} \to \mathcal{X}$.

March 2, 2024 Read
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Semi-Discrete Optimal Transport for Texture Synthesis

Texture synthesis is a technique that consists in generating some realistic textures by imitating the patterns of a given exemplar texture. It plays a crucial role in many domains such as computer graphics, where the synthesis quality directly impacts the visual quality and the realism of graphical environments. The objective is to have a realistic replica in a visual sense but with original content: we don’t simply want to copy parts of the original texture for the sake of visual quality and realism.

March 2, 2024 Read
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Mathematics of Diffusion models

Introduction This blog post aims to develop and explain the mathematical foundations of diffusion models 1, and image-to-image diffusion models 2 3. This work is part of a larger project on image colorization using diffusion, which was done in collaboration with Brennan Whitfield, and Vivek Shome in 2022. This blog post is inspired by Lilian Weng’s blog post on diffusion models 4, but contains more details in the mathematical derivations, which may help in understanding certain aspects.

January 30, 2023 Read
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