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98 lines
3.5 KiB
98 lines
3.5 KiB
9 months ago
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# code adapted from https://github.com/exx8/differential-diffusion
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import torch
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import inspect
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class DifferentialDiffusion():
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@classmethod
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def INPUT_TYPES(s):
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return {"required": {"model": ("MODEL", ),
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}}
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RETURN_TYPES = ("MODEL",)
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FUNCTION = "apply"
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CATEGORY = "_for_testing"
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INIT = False
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@classmethod
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def IS_CHANGED(s, *args, **kwargs):
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DifferentialDiffusion.INIT = s.INIT = True
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return ""
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def __init__(self) -> None:
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DifferentialDiffusion.INIT = False
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self.sigmas: torch.Tensor = None
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self.thresholds: torch.Tensor = None
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self.mask_i = None
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self.valid_sigmas = False
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self.varying_sigmas_samplers = ["dpmpp_2s", "dpmpp_sde", "dpm_2", "heun", "restart"]
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def apply(self, model):
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model = model.clone()
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model.model_options["denoise_mask_function"] = self.forward
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return (model,)
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def init_sigmas(self, sigma: torch.Tensor, denoise_mask: torch.Tensor):
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self.__init__()
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self.sigmas, sampler = find_outer_instance("sigmas", callback=get_sigmas_and_sampler) or (None, "")
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self.valid_sigmas = not ("sample_" not in sampler or any(s in sampler for s in self.varying_sigmas_samplers)) or "generic" in sampler
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if self.sigmas is None:
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self.sigmas = sigma[:1].repeat(2)
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self.sigmas[-1].zero_()
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self.sigmas_min = self.sigmas.min()
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self.sigmas_max = self.sigmas.max()
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self.thresholds = torch.linspace(1, 0, self.sigmas.shape[0], dtype=sigma.dtype, device=sigma.device)
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self.thresholds_min_len = self.thresholds.shape[0] - 1
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if self.valid_sigmas:
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thresholds = self.thresholds[:-1].reshape(-1, 1, 1, 1, 1)
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mask = denoise_mask.unsqueeze(0)
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mask = (mask >= thresholds).to(denoise_mask.dtype)
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self.mask_i = iter(mask)
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def forward(self, sigma: torch.Tensor, denoise_mask: torch.Tensor):
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if self.sigmas is None or DifferentialDiffusion.INIT:
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self.init_sigmas(sigma, denoise_mask)
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if self.valid_sigmas:
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try:
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return next(self.mask_i)
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except StopIteration:
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self.valid_sigmas = False
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if self.thresholds_min_len > 1:
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nearest_idx = (self.sigmas - sigma[0]).abs().argmin()
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if not self.thresholds_min_len > nearest_idx:
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nearest_idx = -2
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threshold = self.thresholds[nearest_idx]
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else:
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threshold = (sigma[0] - self.sigmas_min) / (self.sigmas_max - self.sigmas_min)
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return (denoise_mask >= threshold).to(denoise_mask.dtype)
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def get_sigmas_and_sampler(frame, target):
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found = frame.f_locals[target]
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if isinstance(found, torch.Tensor) and found[-1] < 0.1:
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return found, frame.f_code.co_name
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return False
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def find_outer_instance(target: str, target_type=None, callback=None):
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frame = inspect.currentframe()
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i = 0
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while frame and i < 100:
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if target in frame.f_locals:
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if callback is not None:
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res = callback(frame, target)
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if res:
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return res
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else:
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found = frame.f_locals[target]
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if isinstance(found, target_type):
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return found
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frame = frame.f_back
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i += 1
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return None
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NODE_CLASS_MAPPINGS = {
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"DifferentialDiffusion": DifferentialDiffusion,
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}
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NODE_DISPLAY_NAME_MAPPINGS = {
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"DifferentialDiffusion": "Differential Diffusion",
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}
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