Add Effnet encode node for stable-cascade img2img

nodes.py

@@ -3575,6 +3575,67 @@ class ImageUpscaleWithModelBatched:
 
         return (t,)    
 
+
+import torchvision
+from torch import nn
+from safetensors import safe_open
+
+class EfficientNetEncoder(nn.Module):
+    def __init__(self, c_latent=16):
+        super().__init__()
+        self.backbone = torchvision.models.efficientnet_v2_s(weights='DEFAULT').features.eval()
+        self.mapper = nn.Sequential(
+            nn.Conv2d(1280, c_latent, kernel_size=1, bias=False),
+            nn.BatchNorm2d(c_latent, affine=False),  # then normalize them to have mean 0 and std 1
+        )
+
+    def forward(self, x):
+        return self.mapper(self.backbone(x))
+    
+class EffnetEncode:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": { 
+                              "image": ("IMAGE",),
+                              }}
+    RETURN_TYPES = ("LATENT",)
+    FUNCTION = "encode"
+
+    CATEGORY = "KJNodes"
+
+    def encode(self, image):
+        device = comfy.model_management.get_torch_device()
+
+        image = image.permute(0, 3, 1, 2).to(device)
+        effnet_preprocess = torchvision.transforms.Compose([
+            torchvision.transforms.Normalize(
+                mean=(0.485, 0.456, 0.406), std=(0.229, 0.224, 0.225)
+            )
+        ])
+        image = effnet_preprocess(image)
+        effnet = EfficientNetEncoder()
+
+        effnet_checkpoint = os.path.join(folder_paths.models_dir,"vae", "Stable-cascade","effnet_encoder.safetensors")
+        if not os.path.exists(effnet_checkpoint):
+            try:
+                from huggingface_hub import snapshot_download
+                download_to = os.path.join(folder_paths.models_dir,'vae', "Stable-cascade")
+                snapshot_download(repo_id="stabilityai/stable-cascade", allow_patterns=["effnet_encoder.safetensors"], 
+                                    local_dir=download_to, local_dir_use_symlinks=False)
+            except:
+                raise Exception("Model not found and download failed. (https://huggingface.co/stabilityai/stable-cascade, effnet_encoder.safetensors)")
+
+        effnet_state_dict = {}
+        with safe_open(effnet_checkpoint, framework="pt", device="cpu") as f:
+            for key in f.keys():
+                effnet_state_dict[key] = f.get_tensor(key)
+
+        effnet.load_state_dict(effnet_state_dict if 'state_dict' not in effnet_checkpoint else effnet_checkpoint['state_dict'])
+        effnet.eval().requires_grad_(False).to(device)
+        t = effnet(image)
+        return ({"samples":t}, )  
+
+
 NODE_CLASS_MAPPINGS = {
     "INTConstant": INTConstant,
     "FloatConstant": FloatConstant,
@@ -3640,7 +3701,8 @@ NODE_CLASS_MAPPINGS = {
     "GLIGENTextBoxApplyBatch": GLIGENTextBoxApplyBatch,
     "CondPassThrough": CondPassThrough,
     "ImageUpscaleWithModelBatched": ImageUpscaleWithModelBatched,
-    "ScaleBatchPromptSchedule": ScaleBatchPromptSchedule
+    "ScaleBatchPromptSchedule": ScaleBatchPromptSchedule,
+    "EffnetEncode": EffnetEncode
 }
 NODE_DISPLAY_NAME_MAPPINGS = {
     "INTConstant": "INT Constant",
@@ -3706,5 +3768,6 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "GLIGENTextBoxApplyBatch": "GLIGENTextBoxApplyBatch",
     "CondPassThrough": "CondPassThrough",
     "ImageUpscaleWithModelBatched": "ImageUpscaleWithModelBatched",
-    "ScaleBatchPromptSchedule": "ScaleBatchPromptSchedule"
+    "ScaleBatchPromptSchedule": "ScaleBatchPromptSchedule",
+    "EffnetEncode": "EffnetEncode"
 }