Move latent scale factor from VAE to model.

comfy/latent_formats.py

+
+class LatentFormat:
+    def process_in(self, latent):
+        return latent * self.scale_factor
+
+    def process_out(self, latent):
+        return latent / self.scale_factor
+
+class SD15(LatentFormat):
+    def __init__(self, scale_factor=0.18215):
+        self.scale_factor = scale_factor
+
+class SDXL(LatentFormat):
+    def __init__(self):
+        self.scale_factor = 0.13025
+

comfy/model_base.py

@@ -6,9 +6,11 @@ from comfy.ldm.modules.diffusionmodules.openaimodel import Timestep
 import numpy as np
 
 class BaseModel(torch.nn.Module):
-    def __init__(self, unet_config, v_prediction=False):
+    def __init__(self, model_config, v_prediction=False):
         super().__init__()
 
+        unet_config = model_config.unet_config
+        self.latent_format = model_config.latent_format
         self.register_schedule(given_betas=None, beta_schedule="linear", timesteps=1000, linear_start=0.00085, linear_end=0.012, cosine_s=8e-3)
         self.diffusion_model = UNetModel(**unet_config)
         self.v_prediction = v_prediction
@@ -75,9 +77,16 @@ class BaseModel(torch.nn.Module):
         del to_load
         return self
 
+    def process_latent_in(self, latent):
+        return self.latent_format.process_in(latent)
+
+    def process_latent_out(self, latent):
+        return self.latent_format.process_out(latent)
+
+
 class SD21UNCLIP(BaseModel):
-    def __init__(self, unet_config, noise_aug_config, v_prediction=True):
-        super().__init__(unet_config, v_prediction)
+    def __init__(self, model_config, noise_aug_config, v_prediction=True):
+        super().__init__(model_config, v_prediction)
         self.noise_augmentor = CLIPEmbeddingNoiseAugmentation(**noise_aug_config)
 
     def encode_adm(self, **kwargs):
@@ -112,13 +121,13 @@ class SD21UNCLIP(BaseModel):
         return adm_out
 
 class SDInpaint(BaseModel):
-    def __init__(self, unet_config, v_prediction=False):
-        super().__init__(unet_config, v_prediction)
+    def __init__(self, model_config, v_prediction=False):
+        super().__init__(model_config, v_prediction)
         self.concat_keys = ("mask", "masked_image")
 
 class SDXLRefiner(BaseModel):
-    def __init__(self, unet_config, v_prediction=False):
-        super().__init__(unet_config, v_prediction)
+    def __init__(self, model_config, v_prediction=False):
+        super().__init__(model_config, v_prediction)
         self.embedder = Timestep(256)
 
     def encode_adm(self, **kwargs):
@@ -144,8 +153,8 @@ class SDXLRefiner(BaseModel):
         return torch.cat((clip_pooled.to(flat.device), flat), dim=1)
 
 class SDXL(BaseModel):
-    def __init__(self, unet_config, v_prediction=False):
-        super().__init__(unet_config, v_prediction)
+    def __init__(self, model_config, v_prediction=False):
+        super().__init__(model_config, v_prediction)
         self.embedder = Timestep(256)
 
     def encode_adm(self, **kwargs):

comfy/samplers.py

@@ -586,6 +586,9 @@ class KSampler:
             positive = encode_adm(self.model, positive, noise.shape[0], noise.shape[3], noise.shape[2], self.device, "positive")
             negative = encode_adm(self.model, negative, noise.shape[0], noise.shape[3], noise.shape[2], self.device, "negative")
 
+        if latent_image is not None:
+            latent_image = self.model.process_latent_in(latent_image)
+
         extra_args = {"cond":positive, "uncond":negative, "cond_scale": cfg, "model_options": self.model_options}
 
         cond_concat = None
@@ -672,4 +675,4 @@ class KSampler:
                 else:
                     samples = getattr(k_diffusion_sampling, "sample_{}".format(self.sampler))(self.model_k, noise, sigmas, extra_args=extra_args, callback=k_callback, disable=disable_pbar)
 
-        return samples.to(torch.float32)
+        return self.model.process_latent_out(samples.to(torch.float32))

comfy/sd.py

@@ -536,7 +536,7 @@ class CLIP:
 
 
 class VAE:
-    def __init__(self, ckpt_path=None, scale_factor=0.18215, device=None, config=None):
+    def __init__(self, ckpt_path=None, device=None, config=None):
         if config is None:
             #default SD1.x/SD2.x VAE parameters
             ddconfig = {'double_z': True, 'z_channels': 4, 'resolution': 256, 'in_channels': 3, 'out_ch': 3, 'ch': 128, 'ch_mult': [1, 2, 4, 4], 'num_res_blocks': 2, 'attn_resolutions': [], 'dropout': 0.0}
@@ -550,7 +550,6 @@ class VAE:
                 sd = diffusers_convert.convert_vae_state_dict(sd)
             self.first_stage_model.load_state_dict(sd, strict=False)
 
-        self.scale_factor = scale_factor
         if device is None:
             device = model_management.get_torch_device()
         self.device = device
@@ -561,7 +560,7 @@ class VAE:
         steps += samples.shape[0] * utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x * 2, tile_y // 2, overlap)
         pbar = utils.ProgressBar(steps)
 
-        decode_fn = lambda a: (self.first_stage_model.decode(1. / self.scale_factor * a.to(self.device)) + 1.0)
+        decode_fn = lambda a: (self.first_stage_model.decode(a.to(self.device)) + 1.0)
         output = torch.clamp((
             (utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = 8, pbar = pbar) +
             utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = 8, pbar = pbar) +
@@ -575,7 +574,7 @@ class VAE:
         steps += pixel_samples.shape[0] * utils.get_tiled_scale_steps(pixel_samples.shape[3], pixel_samples.shape[2], tile_x * 2, tile_y // 2, overlap)
         pbar = utils.ProgressBar(steps)
 
-        encode_fn = lambda a: self.first_stage_model.encode(2. * a.to(self.device) - 1.).sample() * self.scale_factor
+        encode_fn = lambda a: self.first_stage_model.encode(2. * a.to(self.device) - 1.).sample()
         samples = utils.tiled_scale(pixel_samples, encode_fn, tile_x, tile_y, overlap, upscale_amount = (1/8), out_channels=4, pbar=pbar)
         samples += utils.tiled_scale(pixel_samples, encode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = (1/8), out_channels=4, pbar=pbar)
         samples += utils.tiled_scale(pixel_samples, encode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = (1/8), out_channels=4, pbar=pbar)
@@ -593,7 +592,7 @@ class VAE:
             pixel_samples = torch.empty((samples_in.shape[0], 3, round(samples_in.shape[2] * 8), round(samples_in.shape[3] * 8)), device="cpu")
             for x in range(0, samples_in.shape[0], batch_number):
                 samples = samples_in[x:x+batch_number].to(self.device)
-                pixel_samples[x:x+batch_number] = torch.clamp((self.first_stage_model.decode(1. / self.scale_factor * samples) + 1.0) / 2.0, min=0.0, max=1.0).cpu()
+                pixel_samples[x:x+batch_number] = torch.clamp((self.first_stage_model.decode(samples) + 1.0) / 2.0, min=0.0, max=1.0).cpu()
         except model_management.OOM_EXCEPTION as e:
             print("Warning: Ran out of memory when regular VAE decoding, retrying with tiled VAE decoding.")
             pixel_samples = self.decode_tiled_(samples_in)
@@ -620,7 +619,7 @@ class VAE:
             samples = torch.empty((pixel_samples.shape[0], 4, round(pixel_samples.shape[2] // 8), round(pixel_samples.shape[3] // 8)), device="cpu")
             for x in range(0, pixel_samples.shape[0], batch_number):
                 pixels_in = (2. * pixel_samples[x:x+batch_number] - 1.).to(self.device)
-                samples[x:x+batch_number] = self.first_stage_model.encode(pixels_in).sample().cpu() * self.scale_factor
+                samples[x:x+batch_number] = self.first_stage_model.encode(pixels_in).sample().cpu()
 
         except model_management.OOM_EXCEPTION as e:
             print("Warning: Ran out of memory when regular VAE encoding, retrying with tiled VAE encoding.")
@@ -958,6 +957,7 @@ def load_gligen(ckpt_path):
     return model
 
 def load_checkpoint(config_path=None, ckpt_path=None, output_vae=True, output_clip=True, embedding_directory=None, state_dict=None, config=None):
+    #TODO: this function is a mess and should be removed eventually
     if config is None:
         with open(config_path, 'r') as stream:
             config = yaml.safe_load(stream)
@@ -992,12 +992,20 @@ def load_checkpoint(config_path=None, ckpt_path=None, output_vae=True, output_cl
     if state_dict is None:
         state_dict = utils.load_torch_file(ckpt_path)
 
+    class EmptyClass:
+        pass
+
+    model_config = EmptyClass()
+    model_config.unet_config = unet_config
+    from . import latent_formats
+    model_config.latent_format = latent_formats.SD15(scale_factor=scale_factor)
+
     if config['model']["target"].endswith("LatentInpaintDiffusion"):
-        model = model_base.SDInpaint(unet_config, v_prediction=v_prediction)
+        model = model_base.SDInpaint(model_config, v_prediction=v_prediction)
     elif config['model']["target"].endswith("ImageEmbeddingConditionedLatentDiffusion"):
-        model = model_base.SD21UNCLIP(unet_config, noise_aug_config["params"], v_prediction=v_prediction)
+        model = model_base.SD21UNCLIP(model_config, noise_aug_config["params"], v_prediction=v_prediction)
     else:
-        model = model_base.BaseModel(unet_config, v_prediction=v_prediction)
+        model = model_base.BaseModel(model_config, v_prediction=v_prediction)
 
     if fp16:
         model = model.half()
@@ -1006,14 +1014,12 @@ def load_checkpoint(config_path=None, ckpt_path=None, output_vae=True, output_cl
 
     if output_vae:
         w = WeightsLoader()
-        vae = VAE(scale_factor=scale_factor, config=vae_config)
+        vae = VAE(config=vae_config)
         w.first_stage_model = vae.first_stage_model
         load_model_weights(w, state_dict)
 
     if output_clip:
         w = WeightsLoader()
-        class EmptyClass:
-            pass
         clip_target = EmptyClass()
         clip_target.params = clip_config.get("params", {})
         if clip_config["target"].endswith("FrozenOpenCLIPEmbedder"):
@@ -1055,7 +1061,7 @@ def load_checkpoint_guess_config(ckpt_path, output_vae=True, output_clip=True, o
     model.load_model_weights(sd, "model.diffusion_model.")
 
     if output_vae:
-        vae = VAE(scale_factor=model_config.vae_scale_factor)
+        vae = VAE()
         w = WeightsLoader()
         w.first_stage_model = vae.first_stage_model
         load_model_weights(w, sd)

comfy/supported_models.py

@@ -7,6 +7,7 @@ from . import sd2_clip
 from . import sdxl_clip
 
 from . import supported_models_base
+from . import latent_formats
 
 class SD15(supported_models_base.BASE):
     unet_config = {
@@ -21,7 +22,7 @@ class SD15(supported_models_base.BASE):
         "num_head_channels": -1,
     }
 
-    vae_scale_factor = 0.18215
+    latent_format = latent_formats.SD15
 
     def process_clip_state_dict(self, state_dict):
         k = list(state_dict.keys())
@@ -48,7 +49,7 @@ class SD20(supported_models_base.BASE):
         "adm_in_channels": None,
     }
 
-    vae_scale_factor = 0.18215
+    latent_format = latent_formats.SD15
 
     def v_prediction(self, state_dict):
         if self.unet_config["in_channels"] == 4: #SD2.0 inpainting models are not v prediction
@@ -97,10 +98,10 @@ class SDXLRefiner(supported_models_base.BASE):
         "transformer_depth": [0, 4, 4, 0],
     }
 
-    vae_scale_factor = 0.13025
+    latent_format = latent_formats.SDXL
 
     def get_model(self, state_dict):
-        return model_base.SDXLRefiner(self.unet_config)
+        return model_base.SDXLRefiner(self)
 
     def process_clip_state_dict(self, state_dict):
         keys_to_replace = {}
@@ -124,10 +125,10 @@ class SDXL(supported_models_base.BASE):
         "adm_in_channels": 2816
     }
 
-    vae_scale_factor = 0.13025
+    latent_format = latent_formats.SDXL
 
     def get_model(self, state_dict):
-        return model_base.SDXL(self.unet_config)
+        return model_base.SDXL(self)
 
     def process_clip_state_dict(self, state_dict):
         keys_to_replace = {}

comfy/supported_models_base.py

@@ -49,16 +49,17 @@ class BASE:
 
     def __init__(self, unet_config):
         self.unet_config = unet_config
+        self.latent_format = self.latent_format()
         for x in self.unet_extra_config:
             self.unet_config[x] = self.unet_extra_config[x]
 
     def get_model(self, state_dict):
         if self.inpaint_model():
-            return model_base.SDInpaint(self.unet_config, v_prediction=self.v_prediction(state_dict))
+            return model_base.SDInpaint(self, v_prediction=self.v_prediction(state_dict))
         elif self.noise_aug_config is not None:
-            return model_base.SD21UNCLIP(self.unet_config, self.noise_aug_config, v_prediction=self.v_prediction(state_dict))
+            return model_base.SD21UNCLIP(self, self.noise_aug_config, v_prediction=self.v_prediction(state_dict))
         else:
-            return model_base.BaseModel(self.unet_config, v_prediction=self.v_prediction(state_dict))
+            return model_base.BaseModel(self, v_prediction=self.v_prediction(state_dict))
 
     def process_clip_state_dict(self, state_dict):
         return state_dict

nodes.py

@@ -284,6 +284,7 @@ class SaveLatent:
 
         output = {}
         output["latent_tensor"] = samples["samples"]
+        output["latent_format_version_0"] = torch.tensor([])
 
         safetensors.torch.save_file(output, file, metadata=metadata)
 
@@ -305,7 +306,10 @@ class LoadLatent:
     def load(self, latent):
         latent_path = folder_paths.get_annotated_filepath(latent)
         latent = safetensors.torch.load_file(latent_path, device="cpu")
-        samples = {"samples": latent["latent_tensor"].float()}
+        multiplier = 1.0
+        if "latent_format_version_0" not in latent:
+            multiplier = 1.0 / 0.18215
+        samples = {"samples": latent["latent_tensor"].float() * multiplier}
         return (samples, )
 
     @classmethod