Truncated Diffusion Probabilistic Models and Diffusion-based Adversarial Auto-EncodersDownload PDF

Published: 01 Feb 2023, Last Modified: 28 Feb 2023ICLR 2023 posterReaders: Everyone
Keywords: Diffusion model, adversarial autoencoder, implicit prior
Abstract: Employing a forward diffusion chain to gradually map the data to a noise distribution, diffusion-based generative models learn how to generate the data by inferring a reverse diffusion chain. However, this approach is slow and costly because it needs many forward and reverse steps. We propose a faster and cheaper approach that adds noise not until the data become pure random noise, but until they reach a hidden noisy data distribution that we can confidently learn. Then, we use fewer reverse steps to generate data by starting from this hidden distribution that is made similar to the noisy data. We reveal that the proposed model can be cast as an adversarial auto-encoder empowered by both the diffusion process and a learnable implicit prior. Experimental results show even with a significantly smaller number of reverse diffusion steps, the proposed truncated diffusion probabilistic models can provide consistent improvements over the non-truncated ones in terms of performance in both unconditional and text-guided image generations.
Anonymous Url: I certify that there is no URL (e.g., github page) that could be used to find authors’ identity.
No Acknowledgement Section: I certify that there is no acknowledgement section in this submission for double blind review.
Code Of Ethics: I acknowledge that I and all co-authors of this work have read and commit to adhering to the ICLR Code of Ethics
Submission Guidelines: Yes
Please Choose The Closest Area That Your Submission Falls Into: Generative models
TL;DR: We propose truncated diffusion probabilistic models, which models an implicit prior to truncate the diffusion chain and requires significantly fewer reverse steps to generate high-quality samples.
Supplementary Material: zip
11 Replies