On Inference Stability for Diffusion Models

Denoising Probabilistic Models (DPMs) represent an emerging domain of generative models that excel in generating diverse and high-quality images. However, most current training methods for DPMs often neglect the correlation between timesteps, limiting the model's performance in generating images effectively. Notably, we theoretically point out that this issue can be caused by the cumulative estimation gap between the predicted and the actual trajectory. To minimize that gap, we propose a novel sequence-aware loss that aims to reduce the estimation gap to enhance the sampling quality. Furthermore, we theoretically show that our proposed loss function is a tighter upper bound of the estimation loss in comparison with the conventional loss in DPMs. Experimental results on several benchmark datasets including CIFAR10, CelebA, and CelebA-HQ consistently show a remarkable improvement of our proposed method regarding the image generalization quality measured by FID and Inception Score compared to several DPM baselines. Our code and pre-trained checkpoints are available at https://github.com/VinAIResearch/SA-DPM.

Authors

• Viet Nguyen VinAI Research, Vietnam
• Giang Vu Hanoi University of Science and Technology, Vietnam Viettel Group, Vietnam
• Tung Nguyen Thanh Hanoi University of Science and Technology, Vietnam Viettel Group, Vietnam
• Khoat Than Hanoi University of Science and Technology, Vietnam
• Toan Tran VinAI Research

Keywords

• ML: Deep Generative Models & Autoencoders