221 lines
9.7 KiB
Python
221 lines
9.7 KiB
Python
import logging
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import torch
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from enum import Enum, auto
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from typing import Any
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class PredictionType(Enum):
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EPS = auto() # ε-prediction
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V = auto() # v-prediction
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X0 = auto() # x₀-prediction
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UNKNOWN = auto() # couldn’t detect / new scheduler
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_RAW_TO_ENUM = {
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"eps": PredictionType.EPS,
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"epsilon": PredictionType.EPS,
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"v": PredictionType.V,
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"v_prediction": PredictionType.V,
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"x0": PredictionType.X0,
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"sample": PredictionType.X0,
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}
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class NRS:
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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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"skew": ("FLOAT", {"default": 4.0, "min": -30.0, "max": 30.0, "step": 0.01}),
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"stretch": ("FLOAT", {"default": 2.0, "min": -30.0, "max": 30.0, "step": 0.01}),
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"squash": ("FLOAT", {"default": 0.0, "min": 0.0, "max": 1.0, "step": 0.01}),
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}}
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RETURN_TYPES = ("MODEL",)
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FUNCTION = "patch"
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CATEGORY = "advanced/model"
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def _get_pred_type(self, model) -> PredictionType:
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"""
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In order to support Comfy, Forge, and possibly other models
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and various loaders.
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Walk common wrappers until we find something that looks like a
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prediction-type flag, then map it to the enum.
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Defaults to EPS if all else fails.
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"""
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def _canon(p):
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if p is None:
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return ""
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if isinstance(p, bytes):
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p = p.decode(errors="ignore")
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if isinstance(p, Enum):
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p = p.name
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return str(p).strip().lower()
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# Breadth-first search through a few well-known wrappers.
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queue, seen = [model], set()
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while queue:
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obj = queue.pop(0)
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# 1) direct hit on this object ---------------------------------
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for attr in ("model_type", "prediction_type", "parameterization"):
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p = _canon(getattr(obj, attr, None))
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if p:
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return _RAW_TO_ENUM.get(p, PredictionType.UNKNOWN)
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# 2) enqueue child containers we care about -------------------
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for attr in ("model", "diffusion_model", "config", "scheduler", "inner_model", "model_sampling"):
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child = getattr(obj, attr, None)
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if child is not None and id(child) not in seen:
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seen.add(id(child))
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queue.append(child)
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# 3) default ------------------------------------------------------
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return PredictionType.UNKNOWN
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def _convert_to_eps_space(self, x_orig, sig_root, sigma, cond, uncond):
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x_div = None
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eps_cond = cond
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eps_uncond = uncond
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if self.__pred_type == PredictionType.V:
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# v → ε conversion
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logging.debug(f"NRS._convert_to_eps_space: generating x_div, eps_cond, and eps_uncond for v-pred")
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x_div = x_orig / (sigma ** 2 + 1)
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eps_cond = ((x_div - (x_orig - cond)) * sig_root) / (sigma)
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eps_uncond = ((x_div - (x_orig - uncond)) * sig_root) / (sigma)
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elif self.__pred_type == PredictionType.EPS:
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logging.debug(f"NRS._convert_to_eps_space: already in eps, no pre-scale needed")
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pass # already in ε space
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elif self.__pred_type == PredictionType.X0:
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raise NotImplementedError("NRS._convert_to_eps_space: x0-prediction not supported yet.")
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else:
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raise RuntimeError("NRS._convert_to_eps_space: Could not determine prediction type for this model.")
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return x_div, eps_cond, eps_uncond
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def _finalize_from_eps_space(self, x_orig, x_div, x_final, sig_root, sigma):
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nrs_result = x_final
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if self.__pred_type == PredictionType.V:
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# ε → v conversion
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logging.debug(f"NRS._finalize_from_eps_space: generating cfg_result for v-pred")
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nrs_result = x_orig - (x_div - x_final * sigma / sig_root)
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elif self.__pred_type == PredictionType.EPS:
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# already in ε space
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logging.debug(f"NRS._finalize_from_eps_space: already in eps, no post-scale needed")
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pass
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elif self.__pred_type == PredictionType.X0:
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raise NotImplementedError("NRS._finalize_from_eps_space: x0-prediction not supported yet.")
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else:
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raise RuntimeError("NRS._finalize_from_eps_space: Could not determine prediction type for this model.")
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return nrs_result
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def _convert_to_v_space(self, x_orig, sig_root, sigma, cond, uncond):
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x_div = None
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v_cond = cond
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v_uncond = uncond
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if self.__pred_type == PredictionType.V:
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logging.debug(f"NRS._convert_to_v_space: already in v, no pre-scale needed")
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pass # already in v space
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elif self.__pred_type == PredictionType.EPS:
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# ε → v conversion
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logging.debug(f"NRS._convert_to_v_space: generating x_div, v_cond, and v_uncond for eps")
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x_div = x_orig / (sigma ** 2 + 1)
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factor = sigma / sig_root
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v_cond = x_orig - (x_div - cond * factor)
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v_uncond = x_orig - (x_div - uncond * factor)
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elif self.__pred_type == PredictionType.X0:
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raise NotImplementedError("NRS._convert_to_v_space: x0-prediction not supported yet.")
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else:
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raise RuntimeError("NRS._convert_to_v_space: Could not determine prediction type for this model.")
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return x_div, v_cond, v_uncond
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def _finalize_from_v_space(self, x_orig, x_div, x_final, sig_root, sigma):
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nrs_result = x_final
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if self.__pred_type == PredictionType.V:
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# already in v space
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logging.debug(f"NRS._finalize_from_v_space: already in v, no post-scale needed")
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pass
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elif self.__pred_type == PredictionType.EPS:
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# v → ε conversion
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logging.debug(f"NRS._finalize_from_v_space: generating cfg_result for eps")
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nrs_result = (x_div - (x_orig - x_final)) * (sig_root / sigma)
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elif self.__pred_type == PredictionType.X0:
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raise NotImplementedError("NRS._finalize_from_v_space: x0-prediction not supported yet.")
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else:
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raise RuntimeError("NRS._finalize_from_v_space: Could not determine prediction type for this model.")
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return nrs_result
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def patch(self, model, skew, stretch, squash):
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self.__pred_type = self._get_pred_type(model) if not hasattr(self, "__pred_type") else self.__pred_type
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self.__OPERATION_SPACE = PredictionType.V
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def nrs(args):
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logging.debug(f"NRS.nrs: Skew: {skew}, Stretch: {stretch}, Squash: {squash}")
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# self.__pred_type = self.__pred_type if self.__pred_type is not None else self._get_pred_type(model)
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cond = args["cond"]
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uncond = args["uncond"]
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x_orig = args["input"]
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sigma = args["sigma"]
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sigma = sigma.view(sigma.shape[:1] + (1,) * (cond.ndim - 1))
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sig_root = (sigma ** 2 + 1).sqrt()
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x_div, nrs_cond, nrs_uncond = None, None, None
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match self.__OPERATION_SPACE:
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case PredictionType.V:
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x_div, nrs_cond, nrs_uncond = self._convert_to_v_space(x_orig, sig_root, sigma, cond, uncond)
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case PredictionType.EPS:
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x_div, nrs_cond, nrs_uncond = self._convert_to_eps_space(x_orig, sig_root, sigma, cond, uncond)
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case PredictionType.X0:
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raise RuntimeError("NRS.nrs: x0-prediction not supported yet.")
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case PredictionType.UNKNOWN:
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raise RuntimeError("NRS.nrs: Could not determine prediction type for this operation.")
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case _:
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raise RuntimeError("NRS.nrs: Invalid PredictionType used.")
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def _dot(a, b):
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return (a*b).sum(dim=1, keepdim=True) # [B,C,W,H] => [B,1,W,H]
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def _nrm2(v):
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return _dot(v, v)
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eps = torch.finfo(nrs_cond.dtype).eps
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c_dot_c = _nrm2(nrs_cond) + eps # [B,1,W,H]
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u_dot_c = _dot(nrs_uncond, nrs_cond) # [B,1,W,H]
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u_on_c = (u_dot_c / c_dot_c) * nrs_cond # [B,1,W,H] * [B,C,H,W]
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# Amplify Cond based on length compared to projection of uncond
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proj_diff = nrs_cond - u_on_c
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stretched = nrs_cond + (stretch * proj_diff)
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# Skew/Steer Conf based on rejection of uncond on cond
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u_rej_c = nrs_uncond - u_on_c
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skewed = stretched - (skew * u_rej_c)
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# Squash final length back down to original length of cond
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cond_len = nrs_cond.norm(dim=1, keepdim=True)
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nrs_len = skewed.norm(dim=1, keepdim=True) + eps
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squash_scale = (1 - squash) + (squash * (cond_len / nrs_len))
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x_final = skewed * squash_scale
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match self.__OPERATION_SPACE:
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case PredictionType.V:
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return self._finalize_from_v_space(x_orig, x_div, x_final, sig_root, sigma)
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case PredictionType.EPS:
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return self._finalize_from_eps_space(x_orig, x_div, x_final, sig_root, sigma)
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case PredictionType.X0:
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raise RuntimeError("NRS.nrs: x0-prediction not supported yet.")
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case PredictionType.UNKNOWN:
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raise RuntimeError("NRS.nrs: Could not determine prediction type for this operation.")
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case _:
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raise RuntimeError("NRS.nrs: Invalid PredictionType used.")
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m = model.clone()
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m.set_model_sampler_cfg_function(nrs, True)
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return (m, )
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NODE_CLASS_MAPPINGS = {
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"NRS": NRS,
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} |