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Amp-Thread-ID: https://ampcode.com/threads/T-019c0d36-8b43-745f-b7b2-e35b53f17fa1
59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
from typing_extensions import override
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import torch
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import torch.nn.functional as F
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from comfy_api.latest import ComfyExtension, io
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class Mahiro(io.ComfyNode):
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@classmethod
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def define_schema(cls):
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return io.Schema(
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node_id="Mahiro",
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display_name="Similarity-Adaptive Guidance",
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category="_for_testing",
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description="Modify the guidance to scale more on the 'direction' of the positive prompt rather than the difference between the negative prompt.",
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inputs=[
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io.Model.Input("model"),
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],
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outputs=[
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io.Model.Output(display_name="patched_model"),
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],
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is_experimental=True,
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search_aliases=["mahiro", "mahiro cfg"],
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)
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@classmethod
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def execute(cls, model) -> io.NodeOutput:
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m = model.clone()
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def mahiro_normd(args):
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scale: float = args['cond_scale']
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cond_p: torch.Tensor = args['cond_denoised']
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uncond_p: torch.Tensor = args['uncond_denoised']
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#naive leap
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leap = cond_p * scale
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#sim with uncond leap
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u_leap = uncond_p * scale
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cfg = args["denoised"]
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merge = (leap + cfg) / 2
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normu = torch.sqrt(u_leap.abs()) * u_leap.sign()
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normm = torch.sqrt(merge.abs()) * merge.sign()
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sim = F.cosine_similarity(normu, normm).mean()
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simsc = 2 * (sim+1)
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wm = (simsc*cfg + (4-simsc)*leap) / 4
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return wm
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m.set_model_sampler_post_cfg_function(mahiro_normd)
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return io.NodeOutput(m)
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class MahiroExtension(ComfyExtension):
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@override
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async def get_node_list(self) -> list[type[io.ComfyNode]]:
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return [
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Mahiro,
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]
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async def comfy_entrypoint() -> MahiroExtension:
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return MahiroExtension()
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