predicted x_0

[betterze]

Dear Zhao,

Thank you for sharing this great work, I really like it.

I am not an expert in sampling. In ddim, we can get the predicted x_0 in each sampling step.

Could we get the predicted x_0 in each sampling step from Unipc?

Thank you for your help.

Best Wishes,

Zongze

[wl-zhao]

Hi,

Thanks for your interest in our work! The $x_0$ can be computed just as in DDIM. You can refer to this function for details.

Best,
Wenliang.

[betterze]

I try to visualize the dynamic of ddim and unipc, and plot the x_t and predicted x_0 over time. I use 50 sampling steps. It seems like the predicted x_0 of ddim is better than that of unipc in early time steps, could you tell me why this happens? thx