Simplify differential diffusion code.

comfy/model_patcher.py

@@ -67,6 +67,9 @@ class ModelPatcher:
     def set_model_unet_function_wrapper(self, unet_wrapper_function):
         self.model_options["model_function_wrapper"] = unet_wrapper_function
 
+    def set_model_denoise_mask_function(self, denoise_mask_function):
+        self.model_options["denoise_mask_function"] = denoise_mask_function
+
     def set_model_patch(self, patch, name):
         to = self.model_options["transformer_options"]
         if "patches" not in to:

comfy/samplers.py

@@ -272,13 +272,14 @@ class CFGNoisePredictor(torch.nn.Module):
         return self.apply_model(*args, **kwargs)
 
 class KSamplerX0Inpaint(torch.nn.Module):
-    def __init__(self, model):
+    def __init__(self, model, sigmas):
         super().__init__()
         self.inner_model = model
+        self.sigmas = sigmas
     def forward(self, x, sigma, uncond, cond, cond_scale, denoise_mask, model_options={}, seed=None):
         if denoise_mask is not None:
             if "denoise_mask_function" in model_options:
-                denoise_mask = model_options["denoise_mask_function"](sigma, denoise_mask)
+                denoise_mask = model_options["denoise_mask_function"](sigma, denoise_mask, extra_options={"model": self.inner_model, "sigmas": self.sigmas})
             latent_mask = 1. - denoise_mask
             x = x * denoise_mask + self.inner_model.inner_model.model_sampling.noise_scaling(sigma.reshape([sigma.shape[0]] + [1] * (len(self.noise.shape) - 1)), self.noise, self.latent_image) * latent_mask
         out = self.inner_model(x, sigma, cond=cond, uncond=uncond, cond_scale=cond_scale, model_options=model_options, seed=seed)
@@ -528,7 +529,7 @@ class KSAMPLER(Sampler):
 
     def sample(self, model_wrap, sigmas, extra_args, callback, noise, latent_image=None, denoise_mask=None, disable_pbar=False):
         extra_args["denoise_mask"] = denoise_mask
-        model_k = KSamplerX0Inpaint(model_wrap)
+        model_k = KSamplerX0Inpaint(model_wrap, sigmas)
         model_k.latent_image = latent_image
         if self.inpaint_options.get("random", False): #TODO: Should this be the default?
             generator = torch.manual_seed(extra_args.get("seed", 41) + 1)

comfy_extras/nodes_differential_diffusion.py

@@ -1,7 +1,6 @@
 # code adapted from https://github.com/exx8/differential-diffusion
 
 import torch
-import inspect
 
 class DifferentialDiffusion():
     @classmethod
@@ -13,82 +12,28 @@ class DifferentialDiffusion():
     CATEGORY = "_for_testing"
     INIT = False
 
-    @classmethod
-    def IS_CHANGED(s, *args, **kwargs):
-        DifferentialDiffusion.INIT = s.INIT = True
-        return ""
-
-    def __init__(self) -> None:
-        DifferentialDiffusion.INIT = False
-        self.sigmas: torch.Tensor = None
-        self.thresholds: torch.Tensor = None
-        self.mask_i = None
-        self.valid_sigmas = False
-        self.varying_sigmas_samplers = ["dpmpp_2s", "dpmpp_sde", "dpm_2", "heun", "restart"]
-
     def apply(self, model):
         model = model.clone()
-        model.model_options["denoise_mask_function"] = self.forward
+        model.set_model_denoise_mask_function(self.forward)
         return (model,)
-    
-    def init_sigmas(self, sigma: torch.Tensor, denoise_mask: torch.Tensor):
-        self.__init__()
-        self.sigmas, sampler = find_outer_instance("sigmas", callback=get_sigmas_and_sampler) or (None, "")
-        self.valid_sigmas = not ("sample_" not in sampler or any(s in sampler for s in self.varying_sigmas_samplers)) or "generic" in sampler
-        if self.sigmas is None:
-            self.sigmas = sigma[:1].repeat(2)
-            self.sigmas[-1].zero_()
-        self.sigmas_min = self.sigmas.min()
-        self.sigmas_max = self.sigmas.max()
-        self.thresholds = torch.linspace(1, 0, self.sigmas.shape[0], dtype=sigma.dtype, device=sigma.device)
-        self.thresholds_min_len = self.thresholds.shape[0] - 1
-        if self.valid_sigmas:
-            thresholds = self.thresholds[:-1].reshape(-1, 1, 1, 1, 1)
-            mask = denoise_mask.unsqueeze(0)
-            mask = (mask >= thresholds).to(denoise_mask.dtype)
-            self.mask_i = iter(mask)
-    
-    def forward(self, sigma: torch.Tensor, denoise_mask: torch.Tensor):
-        if self.sigmas is None or DifferentialDiffusion.INIT:
-            self.init_sigmas(sigma, denoise_mask)
-        if self.valid_sigmas:
-            try:
-                return next(self.mask_i)
-            except StopIteration:
-                self.valid_sigmas = False
-        if self.thresholds_min_len > 1:
-            nearest_idx = (self.sigmas - sigma[0]).abs().argmin()
-            if not self.thresholds_min_len > nearest_idx:
-                nearest_idx = -2
-            threshold = self.thresholds[nearest_idx]
-        else:
-            threshold = (sigma[0] - self.sigmas_min) / (self.sigmas_max - self.sigmas_min)
-        return (denoise_mask >= threshold).to(denoise_mask.dtype)
 
-def get_sigmas_and_sampler(frame, target):
-    found = frame.f_locals[target]
-    if isinstance(found, torch.Tensor) and found[-1] < 0.1:
-        return found, frame.f_code.co_name
-    return False
+    def forward(self, sigma: torch.Tensor, denoise_mask: torch.Tensor, extra_options: dict):
+        model = extra_options["model"]
+        step_sigmas = extra_options["sigmas"]
+        sigma_to = model.inner_model.model_sampling.sigma_min
+        if step_sigmas[-1] > sigma_to:
+            sigma_to = step_sigmas[-1]
+        sigma_from = step_sigmas[0]
+
+        ts_from = model.inner_model.model_sampling.timestep(sigma_from)
+        ts_to = model.inner_model.model_sampling.timestep(sigma_to)
+        current_ts = model.inner_model.model_sampling.timestep(sigma)
+
+        threshold = (current_ts - ts_to) / (ts_from - ts_to)
+
+        return (denoise_mask >= threshold).to(denoise_mask.dtype)
 
-def find_outer_instance(target: str, target_type=None, callback=None):
-    frame = inspect.currentframe()
-    i = 0
-    while frame and i < 100:
-        if target in frame.f_locals:
-            if callback is not None:
-                res = callback(frame, target)
-                if res:
-                    return res
-            else:
-                found = frame.f_locals[target]
-                if isinstance(found, target_type):
-                    return found
-        frame = frame.f_back
-        i += 1
-    return None
 
-    
 NODE_CLASS_MAPPINGS = {
     "DifferentialDiffusion": DifferentialDiffusion,
 }