Support loading the Stable Cascade effnet and previewer as a VAE.

The effnet can be used to encode images for img2img with Stage C.

comfy/sd.py

@@ -4,6 +4,7 @@ from enum import Enum
 from comfy import model_management
 from .ldm.models.autoencoder import AutoencoderKL, AutoencodingEngine
 from .ldm.cascade.stage_a import StageA
+from .ldm.cascade.stage_c_coder import StageC_coder
 
 import yaml
 
@@ -158,6 +159,7 @@ class VAE:
         self.memory_used_encode = lambda shape, dtype: (1767 * shape[2] * shape[3]) * model_management.dtype_size(dtype) #These are for AutoencoderKL and need tweaking (should be lower)
         self.memory_used_decode = lambda shape, dtype: (2178 * shape[2] * shape[3] * 64) * model_management.dtype_size(dtype)
         self.downscale_ratio = 8
+        self.upscale_ratio = 8
         self.latent_channels = 4
         self.process_input = lambda image: image * 2.0 - 1.0
         self.process_output = lambda image: torch.clamp((image + 1.0) / 2.0, min=0.0, max=1.0)
@@ -176,11 +178,31 @@ class VAE:
             elif "vquantizer.codebook.weight" in sd: #VQGan: stage a of stable cascade
                 self.first_stage_model = StageA()
                 self.downscale_ratio = 4
+                self.upscale_ratio = 4
                 #TODO
                 #self.memory_used_encode
                 #self.memory_used_decode
                 self.process_input = lambda image: image
                 self.process_output = lambda image: image
+            elif "backbone.1.0.block.0.1.num_batches_tracked" in sd: #effnet: encoder for stage c latent of stable cascade
+                self.first_stage_model = StageC_coder()
+                self.downscale_ratio = 32
+                self.latent_channels = 16
+                new_sd = {}
+                for k in sd:
+                    new_sd["encoder.{}".format(k)] = sd[k]
+                sd = new_sd
+            elif "blocks.11.num_batches_tracked" in sd: #previewer: decoder for stage c latent of stable cascade
+                self.first_stage_model = StageC_coder()
+                self.latent_channels = 16
+                new_sd = {}
+                for k in sd:
+                    new_sd["previewer.{}".format(k)] = sd[k]
+                sd = new_sd
+            elif "encoder.backbone.1.0.block.0.1.num_batches_tracked" in sd: #combined effnet and previewer for stable cascade
+                self.first_stage_model = StageC_coder()
+                self.downscale_ratio = 32
+                self.latent_channels = 16
             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}
@@ -188,6 +210,7 @@ class VAE:
                 if 'encoder.down.2.downsample.conv.weight' not in sd: #Stable diffusion x4 upscaler VAE
                     ddconfig['ch_mult'] = [1, 2, 4]
                     self.downscale_ratio = 4
+                    self.upscale_ratio = 4
 
                 self.first_stage_model = AutoencoderKL(ddconfig=ddconfig, embed_dim=4)
         else:
@@ -213,6 +236,15 @@ class VAE:
 
         self.patcher = comfy.model_patcher.ModelPatcher(self.first_stage_model, load_device=self.device, offload_device=offload_device)
 
+    def vae_encode_crop_pixels(self, pixels):
+        x = (pixels.shape[1] // self.downscale_ratio) * self.downscale_ratio
+        y = (pixels.shape[2] // self.downscale_ratio) * self.downscale_ratio
+        if pixels.shape[1] != x or pixels.shape[2] != y:
+            x_offset = (pixels.shape[1] % self.downscale_ratio) // 2
+            y_offset = (pixels.shape[2] % self.downscale_ratio) // 2
+            pixels = pixels[:, x_offset:x + x_offset, y_offset:y + y_offset, :]
+        return pixels
+
     def decode_tiled_(self, samples, tile_x=64, tile_y=64, overlap = 16):
         steps = samples.shape[0] * comfy.utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x, tile_y, overlap)
         steps += samples.shape[0] * comfy.utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x // 2, tile_y * 2, overlap)
@@ -221,9 +253,9 @@ class VAE:
 
         decode_fn = lambda a: self.first_stage_model.decode(a.to(self.vae_dtype).to(self.device)).float()
         output = self.process_output(
-            (comfy.utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = self.downscale_ratio, output_device=self.output_device, pbar = pbar) +
+            (comfy.utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar) +
-            comfy.utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = self.downscale_ratio, output_device=self.output_device, pbar = pbar) +
+            comfy.utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar) +
-             comfy.utils.tiled_scale(samples, decode_fn, tile_x, tile_y, overlap, upscale_amount = self.downscale_ratio, output_device=self.output_device, pbar = pbar))
+             comfy.utils.tiled_scale(samples, decode_fn, tile_x, tile_y, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar))
             / 3.0)
         return output
 
@@ -248,7 +280,7 @@ class VAE:
             batch_number = int(free_memory / memory_used)
             batch_number = max(1, batch_number)
 
-            pixel_samples = torch.empty((samples_in.shape[0], 3, round(samples_in.shape[2] * self.downscale_ratio), round(samples_in.shape[3] * self.downscale_ratio)), device=self.output_device)
+            pixel_samples = torch.empty((samples_in.shape[0], 3, round(samples_in.shape[2] * self.upscale_ratio), round(samples_in.shape[3] * self.upscale_ratio)), device=self.output_device)
             for x in range(0, samples_in.shape[0], batch_number):
                 samples = samples_in[x:x+batch_number].to(self.vae_dtype).to(self.device)
                 pixel_samples[x:x+batch_number] = self.process_output(self.first_stage_model.decode(samples).to(self.output_device).float())
@@ -265,6 +297,7 @@ class VAE:
         return output.movedim(1,-1)
 
     def encode(self, pixel_samples):
+        pixel_samples = self.vae_encode_crop_pixels(pixel_samples)
         pixel_samples = pixel_samples.movedim(-1,1)
         try:
             memory_used = self.memory_used_encode(pixel_samples.shape, self.vae_dtype)
@@ -284,6 +317,7 @@ class VAE:
         return samples
 
     def encode_tiled(self, pixel_samples, tile_x=512, tile_y=512, overlap = 64):
+        pixel_samples = self.vae_encode_crop_pixels(pixel_samples)
         model_management.load_model_gpu(self.patcher)
         pixel_samples = pixel_samples.movedim(-1,1)
         samples = self.encode_tiled_(pixel_samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap)

nodes.py

@@ -309,18 +309,7 @@ class VAEEncode:
 
     CATEGORY = "latent"
 
-    @staticmethod
-    def vae_encode_crop_pixels(pixels):
-        x = (pixels.shape[1] // 8) * 8
-        y = (pixels.shape[2] // 8) * 8
-        if pixels.shape[1] != x or pixels.shape[2] != y:
-            x_offset = (pixels.shape[1] % 8) // 2
-            y_offset = (pixels.shape[2] % 8) // 2
-            pixels = pixels[:, x_offset:x + x_offset, y_offset:y + y_offset, :]
-        return pixels
-
     def encode(self, vae, pixels):
-        pixels = self.vae_encode_crop_pixels(pixels)
         t = vae.encode(pixels[:,:,:,:3])
         return ({"samples":t}, )
 
@@ -336,7 +325,6 @@ class VAEEncodeTiled:
     CATEGORY = "_for_testing"
 
     def encode(self, vae, pixels, tile_size):
-        pixels = VAEEncode.vae_encode_crop_pixels(pixels)
         t = vae.encode_tiled(pixels[:,:,:,:3], tile_x=tile_size, tile_y=tile_size, )
         return ({"samples":t}, )
 
@@ -350,14 +338,14 @@ class VAEEncodeForInpaint:
     CATEGORY = "latent/inpaint"
 
     def encode(self, vae, pixels, mask, grow_mask_by=6):
-        x = (pixels.shape[1] // 8) * 8
+        x = (pixels.shape[1] // vae.downscale_ratio) * vae.downscale_ratio
-        y = (pixels.shape[2] // 8) * 8
+        y = (pixels.shape[2] // vae.downscale_ratio) * vae.downscale_ratio
         mask = torch.nn.functional.interpolate(mask.reshape((-1, 1, mask.shape[-2], mask.shape[-1])), size=(pixels.shape[1], pixels.shape[2]), mode="bilinear")
 
         pixels = pixels.clone()
         if pixels.shape[1] != x or pixels.shape[2] != y:
-            x_offset = (pixels.shape[1] % 8) // 2
+            x_offset = (pixels.shape[1] % vae.downscale_ratio) // 2
-            y_offset = (pixels.shape[2] % 8) // 2
+            y_offset = (pixels.shape[2] % vae.downscale_ratio) // 2
             pixels = pixels[:,x_offset:x + x_offset, y_offset:y + y_offset,:]
             mask = mask[:,:,x_offset:x + x_offset, y_offset:y + y_offset]