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Extracting Training Data from Diffusion Models

Image diffusion models such as DALL-E 2, Imagen, and Stable Diffusion have attracted significant attention due to their ability to generate high-quality synthetic images.

In this work, authors show that diffusion models memorize individual images from their training data and emit them at generation time. With a generate-and-filter pipeline, we extract over a thousand training examples from stateof-the-art models, ranging from photographs of individual people to trademarked company logos. They also train hundreds of diffusion models in various settings to analyze how different modeling and data decisions affect privacy. Overall, the results show that diffusion models are much less private than prior generative models such as GANs, and that mitigating these vulnerabilities may require new advances in privacy-preserving training.

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