161 lines
7.2 KiB
Python
161 lines
7.2 KiB
Python
from copy import deepcopy
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import comfy.samplers
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import torch
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import math
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original_sampling_function = deepcopy(comfy.samplers.sampling_function)
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minimum_sigma_to_disable_uncond = 1
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def sampling_function_patched(model, x, timestep, uncond, cond, cond_scale, model_options={}, seed=None):
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if math.isclose(cond_scale, 1.0) and model_options.get("disable_cfg1_optimization", False) == False or timestep <= minimum_sigma_to_disable_uncond:
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uncond_ = None
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cond_scale = 1
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else:
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uncond_ = uncond
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cond_pred, uncond_pred = comfy.samplers.calc_cond_uncond_batch(model, cond, uncond_, x, timestep, model_options)
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if "sampler_cfg_function" in model_options:
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args = {"cond": x - cond_pred, "uncond": x - uncond_pred, "cond_scale": cond_scale, "timestep": timestep, "input": x, "sigma": timestep,
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"cond_denoised": cond_pred, "uncond_denoised": uncond_pred, "model": model, "model_options": model_options}
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cfg_result = x - model_options["sampler_cfg_function"](args)
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else:
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cfg_result = uncond_pred + (cond_pred - uncond_pred) * cond_scale
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for fn in model_options.get("sampler_post_cfg_function", []):
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args = {"denoised": cfg_result, "cond": cond, "uncond": uncond, "model": model, "uncond_denoised": uncond_pred, "cond_denoised": cond_pred,
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"sigma": timestep, "model_options": model_options, "input": x}
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cfg_result = fn(args)
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return cfg_result
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def map_sigma(sigma, sigmax, sigmin):
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return 1 + ((sigma - sigmax) * (0 - 1)) / (sigmin - sigmax)
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def center_latent_mean_values(latent, per_channel, mult):
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for b in range(len(latent)):
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if per_channel:
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for c in range(len(latent[b])):
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latent[b][c] -= latent[b][c].mean() * mult
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else:
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latent[b] -= latent[b].mean() * mult
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return latent
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class advancedDynamicCFG:
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def __init__(self):
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self.last_cfg_ht_one = 8
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@classmethod
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def INPUT_TYPES(s):
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return {"required": {
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"model": ("MODEL",),
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"center_mean_post_cfg" : ("BOOLEAN", {"default": True}),
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"center_mean_to_sigma" : ("BOOLEAN", {"default": True}),
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"automatic_cfg" : (["None","soft","hard","include_boost"], {"default": "hard"},),
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"sigma_boost" : ("BOOLEAN", {"default": True}),
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"sigma_boost_percentage": ("FLOAT", {"default": 6.86, "min": 0.0, "max": 100.0, "step": 0.01, "round": 0.01}),
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}}
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RETURN_TYPES = ("MODEL",)
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FUNCTION = "patch"
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CATEGORY = "model_patches"
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def patch(self, model, center_mean_post_cfg, center_mean_to_sigma,
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automatic_cfg, sigma_boost, sigma_boost_percentage):
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global minimum_sigma_to_disable_uncond
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model_sampling = model.model.model_sampling
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sigmin = model_sampling.sigma(model_sampling.timestep(model_sampling.sigma_min))
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sigmax = model_sampling.sigma(model_sampling.timestep(model_sampling.sigma_max))
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if sigma_boost_percentage > 0 and sigma_boost:
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minimum_sigma_to_disable_uncond = (sigmax - sigmin) / 100 * sigma_boost_percentage
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comfy.samplers.sampling_function = sampling_function_patched
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print(f"Sampling function patched. Trigger when sigmas are at: {round(minimum_sigma_to_disable_uncond.item(),4)}")
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else:
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comfy.samplers.sampling_function = original_sampling_function
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print(f"Sampling function unpatched.")
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top_k = 0.25
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reference_cfg = 8
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def linear_cfg(args):
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cond = args["cond"]
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cond_scale = args["cond_scale"]
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uncond = args["uncond"]
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input_x = args["input"]
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sigma = args["sigma"][0]
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if sigma == sigmax or cond_scale > 1:
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self.last_cfg_ht_one = cond_scale
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target_intensity = self.last_cfg_ht_one / 10
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if sigma_boost and cond_scale > 1:
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for b in range(len(cond)):
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for c in range(len(cond[b])):
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uncond[b][c] = uncond[b][c] * torch.norm(cond[b][c]) / torch.norm(uncond[b][c])
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if automatic_cfg == "None" or (cond_scale == 1 and automatic_cfg != "include_boost"):
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return uncond + cond_scale * (cond - uncond)
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if cond_scale > 1:
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denoised_tmp = input_x - (uncond + reference_cfg * (cond - uncond))
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else:
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denoised_tmp = input_x - cond
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for b in range(len(denoised_tmp)):
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for c in range(len(denoised_tmp[b])):
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channel = denoised_tmp[b][c]
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max_values = torch.topk(channel, k=int(len(channel)*top_k), largest=True ).values
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min_values = torch.topk(channel, k=int(len(channel)*top_k), largest=False).values
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max_val = torch.mean(max_values).item()
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if automatic_cfg == "soft":
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min_val = abs(torch.mean(min_values).item())
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elif automatic_cfg == "hard" or automatic_cfg == "include_boost":
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min_val = torch.mean(torch.abs(min_values)).item()
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denoised_range = (max_val + min_val) / 2
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scale_correction = target_intensity / denoised_range
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tmp_scale = reference_cfg * scale_correction
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if cond_scale > 1:
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denoised_tmp[b][c] = uncond[b][c] + tmp_scale * (cond[b][c] - uncond[b][c])
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else:
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denoised_tmp[b][c] = scale_correction * cond[b][c]
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# The scaling has been done per channel, now we set it back to norm.
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if cond_scale == 1:
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denoised_tmp = denoised_tmp * cond.norm() / denoised_tmp.norm()
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return denoised_tmp
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def center_mean_latent_post_cfg(args):
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denoised = args["denoised"]
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sigma = args["sigma"][0]
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mult = map_sigma(sigma, sigmax, sigmin) if center_mean_to_sigma else 1
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denoised = center_latent_mean_values(denoised, False, mult)
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return denoised
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m = model.clone()
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m.set_model_sampler_cfg_function(linear_cfg, disable_cfg1_optimization=False)
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if center_mean_post_cfg:
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m.set_model_sampler_post_cfg_function(center_mean_latent_post_cfg)
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return (m, )
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class simpleDynamicCFG:
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@classmethod
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def INPUT_TYPES(s):
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return {"required": {
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"model": ("MODEL",),
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"boost" : ("BOOLEAN", {"default": True}),
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}}
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RETURN_TYPES = ("MODEL",)
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FUNCTION = "patch"
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CATEGORY = "model_patches"
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def patch(self, model, boost):
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advcfg = advancedDynamicCFG()
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m = advcfg.patch(model,False,False,"hard" if boost else "soft", boost, 6.86)[0]
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return (m, ) |