What's the meaning of this equation in cond_fn (from cgd.py)

[Josh00-Lu]

In cgd.py, in cond_fn(x, t, out, y=None):

fac = diffusion.sqrt_one_minus_alphas_cumprod[current_timestep]
sigmas = 1 - fac
x_in = out["pred_xstart"] * fac + x * sigmas

out["pred_xstart"] is the predicted x0.
x is the current xt.

what the meaning of x_in?

[zhangquanwei962]

Hi, I also have this question, have you resolved it?

[EveningLin]

@zhangquanwei962 @Josh00-Lu Have you figured it out? Can you share your understanding?