Li Y, Yu Z, He G, Shen Y, Li K, Sun X, et al. SPD-DDPM: Denoising Diffusion Probabilistic Models in the Symmetric Positive Definite Space. AAAI [Internet]. 2024 Mar. 24 [cited 2026 May 14];38(12):13709-17. Available from: https://ojs.aaai.org/index.php/AAAI/article/view/29276