Revert "fix alphas cumprod (#475)"

This reverts commit 72139b0.

ldm_patched/modules/model_sampling.py

@@ -76,13 +76,7 @@ def sigma_max(self):
  def timestep(self, sigma):
  log_sigma = sigma.log()
  dists = log_sigma.to(self.log_sigmas.device) - self.log_sigmas[:, None]
- low_idx = dists.ge(0).cumsum(dim=0).argmax(dim=0).clamp(max=self.log_sigmas.shape[0] - 2)
- high_idx = low_idx + 1
- low, high = self.log_sigmas[low_idx], self.log_sigmas[high_idx]
- w = (low - log_sigma) / (low - high)
- w = w.clamp(0, 1)
- t = (1 - w) * low_idx + w * high_idx
- return t.view(sigma.shape)
+ return dists.abs().argmin(dim=0).view(sigma.shape).to(sigma.device)
 
  def sigma(self, timestep):
  t = torch.clamp(timestep.float().to(self.log_sigmas.device), min=0, max=(len(self.sigmas) - 1))

modules/processing.py

@@ -917,13 +917,11 @@ def rescale_zero_terminal_snr_abar(alphas_cumprod):
  alphas_cumprod_backup = p.sd_model.alphas_cumprod
  for modifier in alphas_cumprod_modifiers:
  p.sd_model.alphas_cumprod = modifier(p.sd_model.alphas_cumprod)
- p.sd_model.forge_objects.unet.model.model_sampling.set_sigmas(((1 - p.sd_model.alphas_cumprod) / p.sd_model.alphas_cumprod) ** 0.5)
 
  samples_ddim = p.sample(conditioning=p.c, unconditional_conditioning=p.uc, seeds=p.seeds, subseeds=p.subseeds, subseed_strength=p.subseed_strength, prompts=p.prompts)
 
  if alphas_cumprod_backup is not None:
  p.sd_model.alphas_cumprod = alphas_cumprod_backup
- p.sd_model.forge_objects.unet.model.model_sampling.set_sigmas(((1 - p.sd_model.alphas_cumprod) / p.sd_model.alphas_cumprod) ** 0.5)
 
  if p.scripts is not None:
  ps = scripts.PostSampleArgs(samples_ddim)