8000 Save V-Pred ZSNR metadata in CheckpointSave by pamparamm · Pull Request #7840 · comfyanonymous/ComfyUI · GitHub
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Save V-Pred ZSNR metadata in CheckpointSave #7840

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Merged
merged 1 commit into from
Apr 28, 2025
Merged

Save V-Pred ZSNR metadata in CheckpointSave #7840

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3 changes: 2 additions & 1 deletion comfy/model_sampling.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,13 +111,14 @@ def _register_schedule(self, given_betas=None, beta_schedule="linear", timesteps
self.num_timesteps = int(timesteps)
self.linear_start = linear_start
self.linear_end = linear_end
self.zsnr = zsnr

# self.register_buffer('betas', torch.tensor(betas, dtype=torch.float32))
# self.register_buffer('alphas_cumprod', torch.tensor(alphas_cumprod, dtype=torch.float32))
# self.register_buffer('alphas_cumprod_prev', torch.tensor(alphas_cumprod_prev, dtype=torch.float32))

sigmas = ((1 - alphas_cumprod) / alphas_cumprod) ** 0.5
if zsnr:
if self.zsnr:
sigmas = rescale_zero_terminal_snr_sigmas(sigmas)

self.set_sigmas(sigmas)
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3 changes: 3 additions & 0 deletions comfy_extras/nodes_model_merging.py
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Expand Up @@ -209,6 +209,9 @@ def save_checkpoint(model, clip=None, vae=None, clip_vision=None, filename_prefi
metadata["modelspec.predict_key"] = "epsilon"
elif model.model.model_type == comfy.model_base.ModelType.V_PREDICTION:
metadata["modelspec.predict_key"] = "v"
extra_keys["v_pred"] = torch.tensor([])
if getattr(model_sampling, "zsnr", False):
extra_keys["ztsnr"] = torch.tensor([])

if not args.disable_metadata:
metadata["prompt"] = prompt_info
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