Add taesd and taesdxl to VAELoader node.

They will show up if both the taesd_encoder and taesd_decoder or taesdxl
model files are present in the models/vae_approx directory.

comfy/sd.py

@@ -23,6 +23,7 @@ import comfy.model_patcher
 import comfy.lora
 import comfy.t2i_adapter.adapter
 import comfy.supported_models_base
+import comfy.taesd.taesd
 
 def load_model_weights(model, sd):
     m, u = model.load_state_dict(sd, strict=False)
@@ -154,10 +155,16 @@ class VAE:
         if 'decoder.up_blocks.0.resnets.0.norm1.weight' in sd.keys(): #diffusers format
             sd = diffusers_convert.convert_vae_state_dict(sd)
 
+        self.memory_used_encode = lambda shape: (2078 * shape[2] * shape[3]) * 1.7 #These are for AutoencoderKL and need tweaking
+        self.memory_used_decode = lambda shape: (2562 * shape[2] * shape[3] * 64) * 1.7
+
         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}
-            self.first_stage_model = AutoencoderKL(ddconfig=ddconfig, embed_dim=4)
+            if "taesd_decoder.1.weight" in sd:
+                self.first_stage_model = comfy.taesd.taesd.TAESD()
+            else:
+                #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}
+                self.first_stage_model = AutoencoderKL(ddconfig=ddconfig, embed_dim=4)
         else:
             self.first_stage_model = AutoencoderKL(**(config['params']))
         self.first_stage_model = self.first_stage_model.eval()
@@ -206,7 +213,7 @@ class VAE:
     def decode(self, samples_in):
         self.first_stage_model = self.first_stage_model.to(self.device)
         try:
-            memory_used = (2562 * samples_in.shape[2] * samples_in.shape[3] * 64) * 1.7
+            memory_used = self.memory_used_decode(samples_in.shape)
             model_management.free_memory(memory_used, self.device)
             free_memory = model_management.get_free_memory(self.device)
             batch_number = int(free_memory / memory_used)
@@ -234,7 +241,7 @@ class VAE:
         self.first_stage_model = self.first_stage_model.to(self.device)
         pixel_samples = pixel_samples.movedim(-1,1)
         try:
-            memory_used = (2078 * pixel_samples.shape[2] * pixel_samples.shape[3]) * 1.7 #NOTE: this constant along with the one in the decode above are estimated from the mem usage for the VAE and could change.
+            memory_used = self.memory_used_encode(pixel_samples.shape) #NOTE: this constant along with the one in the decode above are estimated from the mem usage for the VAE and could change.
             model_management.free_memory(memory_used, self.device)
             free_memory = model_management.get_free_memory(self.device)
             batch_number = int(free_memory / memory_used)

comfy/taesd/taesd.py

@@ -46,15 +46,16 @@ class TAESD(nn.Module):
     latent_magnitude = 3
     latent_shift = 0.5
 
-    def __init__(self, encoder_path="taesd_encoder.pth", decoder_path="taesd_decoder.pth"):
+    def __init__(self, encoder_path=None, decoder_path=None):
         """Initialize pretrained TAESD on the given device from the given checkpoints."""
         super().__init__()
-        self.encoder = Encoder()
-        self.decoder = Decoder()
+        self.taesd_encoder = Encoder()
+        self.taesd_decoder = Decoder()
+        self.vae_scale = torch.nn.Parameter(torch.tensor(1.0))
         if encoder_path is not None:
-            self.encoder.load_state_dict(comfy.utils.load_torch_file(encoder_path, safe_load=True))
+            self.taesd_encoder.load_state_dict(comfy.utils.load_torch_file(encoder_path, safe_load=True))
         if decoder_path is not None:
-            self.decoder.load_state_dict(comfy.utils.load_torch_file(decoder_path, safe_load=True))
+            self.taesd_decoder.load_state_dict(comfy.utils.load_torch_file(decoder_path, safe_load=True))
 
     @staticmethod
     def scale_latents(x):
@@ -65,3 +66,11 @@ class TAESD(nn.Module):
     def unscale_latents(x):
         """[0, 1] -> raw latents"""
         return x.sub(TAESD.latent_shift).mul(2 * TAESD.latent_magnitude)
+
+    def decode(self, x):
+        x_sample = self.taesd_decoder(x * self.vae_scale)
+        x_sample = x_sample.sub(0.5).mul(2)
+        return x_sample
+
+    def encode(self, x):
+        return self.taesd_encoder(x * 0.5 + 0.5) / self.vae_scale

latent_preview.py

@@ -22,10 +22,7 @@ class TAESDPreviewerImpl(LatentPreviewer):
         self.taesd = taesd
 
     def decode_latent_to_preview(self, x0):
-        x_sample = self.taesd.decoder(x0[:1])[0].detach()
-        # x_sample = self.taesd.unscale_latents(x_sample).div(4).add(0.5)  # returns value in [-2, 2]
-        x_sample = x_sample.sub(0.5).mul(2)
-
+        x_sample = self.taesd.decode(x0[:1])[0].detach()
         x_sample = torch.clamp((x_sample + 1.0) / 2.0, min=0.0, max=1.0)
         x_sample = 255. * np.moveaxis(x_sample.cpu().numpy(), 0, 2)
         x_sample = x_sample.astype(np.uint8)

nodes.py

@@ -573,9 +573,55 @@ class LoraLoader:
         return (model_lora, clip_lora)
 
 class VAELoader:
+    @staticmethod
+    def vae_list():
+        vaes = folder_paths.get_filename_list("vae")
+        approx_vaes = folder_paths.get_filename_list("vae_approx")
+        sdxl_taesd_enc = False
+        sdxl_taesd_dec = False
+        sd1_taesd_enc = False
+        sd1_taesd_dec = False
+
+        for v in approx_vaes:
+            if v.startswith("taesd_decoder."):
+                sd1_taesd_dec = True
+            elif v.startswith("taesd_encoder."):
+                sd1_taesd_enc = True
+            elif v.startswith("taesdxl_decoder."):
+                sdxl_taesd_dec = True
+            elif v.startswith("taesdxl_encoder."):
+                sdxl_taesd_enc = True
+        if sd1_taesd_dec and sd1_taesd_enc:
+            vaes.append("taesd")
+        if sdxl_taesd_dec and sdxl_taesd_enc:
+            vaes.append("taesdxl")
+        return vaes
+
+    @staticmethod
+    def load_taesd(name):
+        sd = {}
+        approx_vaes = folder_paths.get_filename_list("vae_approx")
+
+        encoder = next(filter(lambda a: a.startswith("{}_encoder.".format(name)), approx_vaes))
+        decoder = next(filter(lambda a: a.startswith("{}_decoder.".format(name)), approx_vaes))
+
+        enc = comfy.utils.load_torch_file(folder_paths.get_full_path("vae_approx", encoder))
+        for k in enc:
+            sd["taesd_encoder.{}".format(k)] = enc[k]
+
+        dec = comfy.utils.load_torch_file(folder_paths.get_full_path("vae_approx", decoder))
+        for k in dec:
+            sd["taesd_decoder.{}".format(k)] = dec[k]
+
+        if name == "taesd":
+            sd["vae_scale"] = torch.tensor(0.18215)
+        elif name == "taesdxl":
+            sd["vae_scale"] = torch.tensor(0.13025)
+        return sd
+
     @classmethod
     def INPUT_TYPES(s):
-        return {"required": { "vae_name": (folder_paths.get_filename_list("vae"), )}}
+        return {"required": { "vae_name": (s.vae_list(), )}}
     RETURN_TYPES = ("VAE",)
     FUNCTION = "load_vae"
 
@@ -583,8 +629,11 @@ class VAELoader:
 
     #TODO: scale factor?
     def load_vae(self, vae_name):
-        vae_path = folder_paths.get_full_path("vae", vae_name)
-        sd = comfy.utils.load_torch_file(vae_path)
+        if vae_name in ["taesd", "taesdxl"]:
+            sd = self.load_taesd(vae_name)
+        else:
+            vae_path = folder_paths.get_full_path("vae", vae_name)
+            sd = comfy.utils.load_torch_file(vae_path)
         vae = comfy.sd.VAE(sd=sd)
         return (vae,)