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__init__.py

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+from .nodes import *
+
+NODE_CLASS_MAPPINGS = {
+    "Uncond Zero":uncondZeroNode,
+}

nodes.py

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+import torch
+class uncondZeroNode:
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": {
+                                "model": ("MODEL",),
+                                "scale": ("FLOAT", {"default": 1, "min": 0.0, "max": 10.0, "step": 0.01, "round": 0.01}),
+                                "method":(["uncond_zero","rescale_cfg"],)
+                              }}
+    RETURN_TYPES = ("MODEL",)
+    FUNCTION = "patch"
+
+    CATEGORY = "model_patches"
+
+    def patch(self, model, scale, method):
+        def uncond_zero(args):
+            cond   = args["cond_denoised"]
+            x_orig = args["input"]
+            x_orig -= x_orig.mean()
+            cond   -= cond.mean()
+            return x_orig - cond / cond.std() * scale
+        
+        new_scale = 1 / (model.model.latent_format.scale_factor * 8)
+
+        #Taken and adapted from comfy_extras/nodes_model_advanced
+        def rescale_cfg(args):
+            x_orig = args["input"]
+            x_orig -= x_orig.mean()
+
+            cond = args["cond_denoised"]
+            cond -= cond.mean()
+            cond = x_orig - cond / cond.std() * scale
+
+            sigma = args["sigma"]
+            sigma = sigma.view(sigma.shape[:1] + (1,) * (cond.ndim - 1))
+            
+            #rescale cfg has to be done on v-pred model output
+            x = x_orig / (sigma * sigma + 1.0)
+            uncond = x / sigma
+            cond = ((x - (x_orig - cond)) * (sigma ** 2 + 1.0) ** 0.5) / (sigma)
+
+            #rescalecfg
+            x_cfg = uncond + new_scale * (cond - uncond)
+            ro_pos = torch.std(cond, dim=(1,2,3), keepdim=True)
+            ro_cfg = torch.std(x_cfg, dim=(1,2,3), keepdim=True)
+
+            x_rescaled = x_cfg * (ro_pos / ro_cfg)
+
+            return x_orig - (x - x_rescaled * sigma / (sigma * sigma + 1.0) ** 0.5)
+
+        m = model.clone()
+        m.set_model_sampler_cfg_function({"uncond_zero":uncond_zero,"rescale_cfg":rescale_cfg}[method])
+        return (m, )