Code Implement about `euler_sampler()`

[chrisway613]

Can anyone explain this line of code:

RectifiedFlow/ImageGeneration/sampling.py

Line 98 in 5a1fd4d

pred_sigma = pred + (sigma_t**2)/(2*(sde.noise_scale**2)*((1.-num_t)**2)) * (0.5 * num_t * (1.-num_t) * pred - 0.5 * (2.-num_t)*x.detach().clone())