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arXiv · 2403.14421

DP-RDM: Adapting Diffusion Models to Private Domains Without Fine-Tuning

Jonathan Lebensold·Maziar Sanjabi·Pietro Astolfi·Adriana Romero-Soriano·Kamalika Chaudhuri·Mike Rabbat·Chuan Guo
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Abstract

Text-to-image diffusion models have been shown to suffer from sample-level memorization, possibly reproducing near-perfect replica of images that they are trained on, which may be undesirable. To remedy this issue, we develop the first differentially private (DP) retrieval-augmented generation algorithm that is capable of generating high-quality image samples while providing provable privacy guarantees. Specifically, we assume access to a text-to-image diffusion model trained on a small amount of public data, and design a DP retrieval mechanism to augment the text prompt with samples retrieved from a private retrieval dataset. Our \emph{differentially private retrieval-augmented diffusion model} (DP-RDM) requires no fine-tuning on the retrieval dataset to adapt to another domain, and can use state-of-the-art generative models to generate high-quality image samples while satisfying rigorous DP guarantees. For instance, when evaluated on MS-COCO, our DP-RDM can generate samples with a privacy budget of $ε=10$, while providing a $3.5$ point improvement in FID compared to public-only retrieval for up to $10,000$ queries.

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Jonathan Lebensold, Maziar Sanjabi, Pietro Astolfi, Adriana Romero-Soriano, Kamalika Chaudhuri, Mike Rabbat, Chuan Guo. 2024-05-13. DP-RDM: Adapting Diffusion Models to Private Domains Without Fine-Tuning. https://arxiv.org/abs/2403.14421

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