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Published 20 hours ago • verified publisher icon LuChengTHU

No randomness is added during the sampling process?

Open PANG-98 opened this issue 1 year ago • 2 comments

Hey fellows, really good work and thanks for sharing the code. However, I've got a question about the sampling process. It seems like no randomness is added during the sampling process, like the z in the following equation. image I've checked the code and it seems like add_noise function defined in DPM_Solver class has never been used. Why is the case? Could you very kindly explain this? Thanks!

PANG-98 avatar Jan 14 '24 08:01 PANG-98

Because DPM-Solver is an ODE-based solver so it does not add noises at the intermediate steps. I also implemented SDE-based DPM-Solver here: https://huggingface.co/docs/diffusers/en/api/schedulers/multistep_dpm_solver

LuChengTHU avatar Mar 09 '24 22:03 LuChengTHU

Because DPM-Solver is an ODE-based solver so it does not add noises at the intermediate steps. I also implemented SDE-based DPM-Solver here: https://huggingface.co/docs/diffusers/en/api/schedulers/multistep_dpm_solver

Thanks for your reply. Any preference for these two implementation? which one is more accurate?

PANG-98 avatar Mar 11 '24 03:03 PANG-98