Towards Accurate Guided Diffusion Sampling through Symplectic Adjoint
  Method
Training-free guided sampling in diffusion models leverages off-the-shelf
pre-trained networks, such as an aesthetic evaluation model, to guide the
generation process. Current training-free guided sampling algorithms obtain the
guidance energy function based on a one-step estimate of the clean image.
However, since the off-the-shelf pre-trained networks are trained on clean
images, the one-step estimation procedure of the clean image may be inaccurate,
especially in the early stages of the generation process in diffusion models.
This causes the guidance in the early time steps to be inaccurate. To overcome
this problem, we propose Symplectic Adjoint Guidance (SAG), which calculates
the gradient guidance in two inner stages. Firstly, SAG estimates the clean
image via n function calls, where n serves as a flexible hyperparameter
that can be tailored to meet specific image quality requirements. Secondly, SAG
uses the symplectic adjoint method to obtain the gradients accurately and
efficiently in terms of the memory requirements. Extensive experiments
demonstrate that SAG generates images with higher qualities compared to the
baselines in both guided image and video generation tasks.
65824fbf083a345666a6bbb7
Jiachun Pan
65824fbf083a345666a6bbb8
Hanshu Yan
admin_assigned
2023-12-20T09:47:21.401Z
631eec57daa9591e522ee721
/avatars/39a6fd3b9717c142b73be8c81c69ebe5.svg
PeRFlow
user
hansyan
65824fbf083a345666a6bbb9
Jun Hao Liew
admin_assigned
2023-12-20T09:47:28.087Z
6305bb149d2531fabd198638
/avatars/0ec3c55d445264d43c0430f9edf88bf8.svg
Jun Hao Liew
user
junhao910323
65824fbf083a345666a6bbba
Jiashi Feng
65824fbf083a345666a6bbbb
Vincent Y. F. Tan
Towards Accurate Guided Diffusion Sampling through Symplectic Adjoint
  Method
Training-free guided sampling in diffusion models leverages off-the-shelf
pre-trained networks, such as an aesthetic evaluation model, to guide the
generation process. Current training-free guided sampling algorithms obtain the
guidance energy function based on a one-step estimate of the clean image.
However, since the off-the-shelf pre-trained networks are trained on clean
images, the one-step estimation procedure of the clean image may be inaccurate,
especially in the early stages of the generation process in diffusion models.
This causes the guidance in the early time steps to be inaccurate. To overcome
this problem, we propose Symplectic Adjoint Guidance (SAG), which calculates
the gradient guidance in two inner stages. Firstly, SAG estimates the clean
image via n function calls, where n serves as a flexible hyperparameter
that can be tailored to meet specific image quality requirements. Secondly, SAG
uses the symplectic adjoint method to obtain the gradients accurately and
efficiently in terms of the memory requirements. Extensive experiments
demonstrate that SAG generates images with higher qualities compared to the
baselines in both guided image and video generation tasks.
Symplectic Adjoint Guidance (SAG) enhances the accuracy and quality of generated images and videos by refining clean image estimation and computing gradients efficiently in diffusion models.
diffusion models guided sampling aesthetic evaluation model guidance energy function symplectic adjoint method image generation video generation