Add a skip layer guidance node that can also skip single layers.

This one should work for skipping the single layers of models like Flux
and Auraflow.

If you want to see how these models work and how many double/single layers
they have see the "ModelMerge*" nodes for the specific model.

comfy_extras/nodes_sd3.py

@@ -3,7 +3,9 @@
 import comfy.model_management
 import nodes
 import torch
-import re
+import comfy_extras.nodes_slg
+
+
 class TripleCLIPLoader:
     @classmethod
     def INPUT_TYPES(s):
@@ -23,6 +25,7 @@ def load_clip(self, clip_name1, clip_name2, clip_name3):
         clip = comfy.sd.load_clip(ckpt_paths=[clip_path1, clip_path2, clip_path3], embedding_directory=folder_paths.get_folder_paths("embeddings"))
         return (clip,)
 
+
 class EmptySD3LatentImage:
     def __init__(self):
         self.device = comfy.model_management.intermediate_device()
@@ -41,6 +44,7 @@ def generate(self, width, height, batch_size=1):
         latent = torch.zeros([batch_size, 16, height // 8, width // 8], device=self.device)
         return ({"samples":latent}, )
 
+
 class CLIPTextEncodeSD3:
     @classmethod
     def INPUT_TYPES(s):
@@ -97,7 +101,8 @@ def INPUT_TYPES(s):
     CATEGORY = "conditioning/controlnet"
     DEPRECATED = True
 
-class SkipLayerGuidanceSD3:
+
+class SkipLayerGuidanceSD3(comfy_extras.nodes_slg.SkipLayerGuidanceDiT):
     '''
     Enhance guidance towards detailed dtructure by having another set of CFG negative with skipped layers.
     Inspired by Perturbed Attention Guidance (https://arxiv.org/abs/2403.17377)
@@ -112,48 +117,12 @@ def INPUT_TYPES(s):
                              "end_percent": ("FLOAT", {"default": 0.15, "min": 0.0, "max": 1.0, "step": 0.001})
                                 }}
     RETURN_TYPES = ("MODEL",)
-    FUNCTION = "skip_guidance"
+    FUNCTION = "skip_guidance_sd3"
 
     CATEGORY = "advanced/guidance"
 
-
-    def skip_guidance(self, model, layers, scale, start_percent, end_percent):
-        if layers == "" or layers == None:
-            return (model, )
-        # check if layer is comma separated integers
-        def skip(args, extra_args):
-            return args
-
-        model_sampling = model.get_model_object("model_sampling")
-        sigma_start = model_sampling.percent_to_sigma(start_percent)
-        sigma_end = model_sampling.percent_to_sigma(end_percent)
-
-        layers = re.findall(r'\d+', layers)
-        layers = [int(i) for i in layers]
-
-        def post_cfg_function(args):
-            model = args["model"]
-            cond_pred = args["cond_denoised"]
-            cond = args["cond"]
-            cfg_result = args["denoised"]
-            sigma = args["sigma"]
-            x = args["input"]
-            model_options = args["model_options"].copy()
-
-            for layer in layers:
-                model_options = comfy.model_patcher.set_model_options_patch_replace(model_options, skip, "dit", "double_block", layer)
-            model_sampling.percent_to_sigma(start_percent)
-
-            sigma_ = sigma[0].item()
-            if scale > 0 and sigma_ >= sigma_end and sigma_ <= sigma_start:
-                (slg,) = comfy.samplers.calc_cond_batch(model, [cond], x, sigma, model_options)
-                cfg_result = cfg_result + (cond_pred - slg) * scale
-            return cfg_result
-
-        m = model.clone()
-        m.set_model_sampler_post_cfg_function(post_cfg_function)
-
-        return (m, )
+    def skip_guidance_sd3(self, model, layers, scale, start_percent, end_percent):
+        return self.skip_guidance(model=model, scale=scale, start_percent=start_percent, end_percent=end_percent, double_layers=layers)
 
 
 NODE_CLASS_MAPPINGS = {

comfy_extras/nodes_slg.py

@@ -0,0 +1,78 @@
+import comfy.model_patcher
+import comfy.samplers
+import re
+
+
+class SkipLayerGuidanceDiT:
+    '''
+    Enhance guidance towards detailed dtructure by having another set of CFG negative with skipped layers.
+    Inspired by Perturbed Attention Guidance (https://arxiv.org/abs/2403.17377)
+    Original experimental implementation for SD3 by Dango233@StabilityAI.
+    '''
+    @classmethod
+    def INPUT_TYPES(s):
+        return {"required": {"model": ("MODEL", ),
+                             "double_layers": ("STRING", {"default": "7, 8, 9", "multiline": False}),
+                             "single_layers": ("STRING", {"default": "7, 8, 9", "multiline": False}),
+                             "scale": ("FLOAT", {"default": 3.0, "min": 0.0, "max": 10.0, "step": 0.1}),
+                             "start_percent": ("FLOAT", {"default": 0.01, "min": 0.0, "max": 1.0, "step": 0.001}),
+                             "end_percent": ("FLOAT", {"default": 0.15, "min": 0.0, "max": 1.0, "step": 0.001})
+                                }}
+    RETURN_TYPES = ("MODEL",)
+    FUNCTION = "skip_guidance"
+    EXPERIMENTAL = True
+
+    DESCRIPTION = "Generic version of SkipLayerGuidance node that can be used on every DiT model."
+
+    CATEGORY = "advanced/guidance"
+
+    def skip_guidance(self, model, scale, start_percent, end_percent, double_layers="", single_layers=""):
+        # check if layer is comma separated integers
+        def skip(args, extra_args):
+            return args
+
+        model_sampling = model.get_model_object("model_sampling")
+        sigma_start = model_sampling.percent_to_sigma(start_percent)
+        sigma_end = model_sampling.percent_to_sigma(end_percent)
+
+        double_layers = re.findall(r'\d+', double_layers)
+        double_layers = [int(i) for i in double_layers]
+
+        single_layers = re.findall(r'\d+', single_layers)
+        single_layers = [int(i) for i in single_layers]
+
+        if len(double_layers) == 0 and len(single_layers) == 0:
+            return (model, )
+
+        def post_cfg_function(args):
+            model = args["model"]
+            cond_pred = args["cond_denoised"]
+            cond = args["cond"]
+            cfg_result = args["denoised"]
+            sigma = args["sigma"]
+            x = args["input"]
+            model_options = args["model_options"].copy()
+
+            for layer in double_layers:
+                model_options = comfy.model_patcher.set_model_options_patch_replace(model_options, skip, "dit", "double_block", layer)
+
+            for layer in single_layers:
+                model_options = comfy.model_patcher.set_model_options_patch_replace(model_options, skip, "dit", "single_block", layer)
+
+            model_sampling.percent_to_sigma(start_percent)
+
+            sigma_ = sigma[0].item()
+            if scale > 0 and sigma_ >= sigma_end and sigma_ <= sigma_start:
+                (slg,) = comfy.samplers.calc_cond_batch(model, [cond], x, sigma, model_options)
+                cfg_result = cfg_result + (cond_pred - slg) * scale
+            return cfg_result
+
+        m = model.clone()
+        m.set_model_sampler_post_cfg_function(post_cfg_function)
+
+        return (m, )
+
+
+NODE_CLASS_MAPPINGS = {
+    "SkipLayerGuidanceDiT": SkipLayerGuidanceDiT,
+}

nodes.py

@@ -2133,6 +2133,7 @@ def init_builtin_extra_nodes():
         "nodes_lora_extract.py",
         "nodes_torch_compile.py",
         "nodes_mochi.py",
+        "nodes_slg.py",
     ]
 
     import_failed = []