### Describe the feature In some vae training, users may use weight adaptive loss which may compute grad of some parameters twice, like  This will trigger backward hook twice. Based on pytorch's document, we may use post-grad-accumulation hook to solve this problem. 
Describe the feature
In some vae training, users may use weight adaptive loss which may compute grad of some parameters twice, like
This will trigger backward hook twice.
Based on pytorch's document, we may use post-grad-accumulation hook to solve this problem.