Trans-Dimensional Generative Modeling via Jump Diffusion Models

Published: 21 Sept 2023, Last Modified: 03 Jan 2024NeurIPS 2023 spotlightEveryoneRevisionsBibTeX
Keywords: diffusion, score-based, score, markov chain, jump diffusion, poisson
TL;DR: We propose a new model class for generating varying dimensional data using jump diffusions.
Abstract: We propose a new class of generative model that naturally handles data of varying dimensionality by jointly modeling the state and dimension of each datapoint. The generative process is formulated as a jump diffusion process that makes jumps between different dimensional spaces. We first define a dimension destroying forward noising process, before deriving the dimension creating time-reversed generative process along with a novel evidence lower bound training objective for learning to approximate it. Simulating our learned approximation to the time-reversed generative process then provides an effective way of sampling data of varying dimensionality by jointly generating state values and dimensions. We demonstrate our approach on molecular and video datasets of varying dimensionality, reporting better compatibility with test-time diffusion guidance imputation tasks and improved interpolation capabilities versus fixed dimensional models that generate state values and dimensions separately.
Supplementary Material: pdf
Submission Number: 2744
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