698 lines
25 KiB
Python
698 lines
25 KiB
Python
import contextlib
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import json
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import math
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import os
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from dataclasses import dataclass
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from typing import List
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import comfy.ldm.modules.attention
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import comfy.samplers
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import torch
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from comfy.model_patcher import ModelPatcher
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from .nodes_registry import comfy_node
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def stg(
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noise_pred_pos,
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noise_pred_neg,
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noise_pred_pertubed,
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cfg_scale,
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stg_scale,
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rescale_scale,
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):
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noise_pred = (
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noise_pred_pos
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+ (cfg_scale - 1) * (noise_pred_pos - noise_pred_neg)
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+ stg_scale * (noise_pred_pos - noise_pred_pertubed)
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)
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if rescale_scale != 0:
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factor = noise_pred_pos.std() / noise_pred.std()
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factor = rescale_scale * factor + (1 - rescale_scale)
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noise_pred = noise_pred * factor
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return noise_pred
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@comfy_node(name="LTXVApplySTG")
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class LTXVApplySTG:
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"model": (
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"MODEL",
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{"tooltip": "The model to apply the STG to."},
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),
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"block_indices": (
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"STRING",
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{
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"default": "14, 19",
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"tooltip": "Comma-separated indices of the blocks to apply the STG to.",
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},
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),
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}
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}
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FUNCTION = "apply_stg"
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RETURN_TYPES = ("MODEL",)
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RETURN_NAMES = ("model",)
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CATEGORY = "lightricks/LTXV"
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DESCRIPTION = "Defines the blocks to apply the STG to."
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def apply_stg(self, model: ModelPatcher, block_indices: str):
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skip_block_list = [int(i.strip()) for i in block_indices.split(",")]
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new_model = model.clone()
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if "skip_block_list" in new_model.model_options["transformer_options"]:
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skip_block_list.extend(
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new_model.model_options["transformer_options"]["skip_block_list"]
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)
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new_model.model_options["transformer_options"][
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"skip_block_list"
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] = skip_block_list
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return (new_model,)
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@dataclass
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class STGFlag:
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do_skip: bool = False
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skip_layers: List[int] = None
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# context manager that replaces the attention function in a transformer block
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class PatchAttention(contextlib.AbstractContextManager):
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def __init__(self, attn_idx=0):
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self.original_attention = comfy.ldm.modules.attention.optimized_attention
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self.original_attention_masked = (
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comfy.ldm.modules.attention.optimized_attention_masked
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)
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self.current_idx = -1
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self.attn_idx = attn_idx
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def __enter__(self):
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comfy.ldm.modules.attention.optimized_attention = self.stg_attention
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comfy.ldm.modules.attention.optimized_attention_masked = (
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self.stg_attention_masked
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)
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def __exit__(self, exc_type, exc_value, traceback):
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comfy.ldm.modules.attention.optimized_attention = self.original_attention
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comfy.ldm.modules.attention.optimized_attention_masked = (
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self.original_attention_masked
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)
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def stg_attention(self, q, k, v, heads, *args, **kwargs):
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self.current_idx += 1
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if self.current_idx == self.attn_idx:
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return v
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else:
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return self.original_attention(q, k, v, heads, *args, **kwargs)
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def stg_attention_masked(self, q, k, v, heads, *args, **kwargs):
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self.current_idx += 1
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if self.current_idx == self.attn_idx:
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return v
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else:
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return self.original_attention_masked(q, k, v, heads, *args, **kwargs)
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class STGBlockWrapper:
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"""Wraps transformer blocks to be able to skip attention layers."""
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def __init__(self, block, stg_flag: STGFlag, idx: int):
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self.flag = stg_flag
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self.idx = idx
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self.block = block
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def __call__(self, args, extra_args):
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context_manager = contextlib.nullcontext()
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if self.flag.do_skip and self.idx in self.flag.skip_layers:
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context_manager = PatchAttention(0)
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with context_manager:
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hidden_state = extra_args["original_block"](args)
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return hidden_state
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class STGGuider(comfy.samplers.CFGGuider):
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def __init__(
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self, model: ModelPatcher, cfg, stg_scale, rescale_scale: float = None
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):
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model = model.clone()
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super().__init__(model)
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self.stg_flag = STGFlag(
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do_skip=False,
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skip_layers=model.model_options["transformer_options"]["skip_block_list"],
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)
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self.patch_model(model, self.stg_flag)
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self.cfg = cfg
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self.stg_scale = stg_scale
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self.rescale_scale = rescale_scale
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@classmethod
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def patch_model(cls, model: ModelPatcher, stg_flag: STGFlag):
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transformer_blocks = cls.get_transformer_blocks(model)
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for i, block in enumerate(transformer_blocks):
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model.set_model_patch_replace(
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STGBlockWrapper(block, stg_flag, i), "dit", "double_block", i
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)
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@staticmethod
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def get_transformer_blocks(model: ModelPatcher):
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diffusion_model = model.get_model_object("diffusion_model")
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key = "diffusion_model.transformer_blocks"
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if diffusion_model.__class__.__name__ == "LTXVTransformer3D":
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key = "diffusion_model.transformer.transformer_blocks"
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return model.get_model_object(key)
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def set_conds(self, positive, negative):
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self.inner_set_conds({"positive": positive, "negative": negative})
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def predict_noise(
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self,
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x: torch.Tensor,
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timestep: torch.Tensor,
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model_options: dict = {},
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seed=None,
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):
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# in CFGGuider.predict_noise, we call sampling_function(), which uses cfg_function() to compute pos & neg
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# but we'd rather do a single batch of sampling pos, neg, and perturbed, so we call calc_cond_batch([perturbed,pos,neg]) directly
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positive_cond = self.conds.get("positive", None)
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negative_cond = self.conds.get("negative", None)
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if model_options.get("sigma_to_params_mapping", None) is not None:
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cfg_value, stg_scale, stg_layer_skip_layer_indices, stg_rescale = (
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model_options["sigma_to_params_mapping"](timestep)
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)
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self.stg_flag.skip_layers = stg_layer_skip_layer_indices
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self.patch_model(self.model_patcher, self.stg_flag)
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else:
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cfg_value = self.cfg
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stg_scale = self.stg_scale
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stg_rescale = self.rescale_scale
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noise_pred_pos = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[positive_cond],
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x,
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timestep,
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model_options,
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)[0]
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noise_pred_neg = 0
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noise_pred_perturbed = 0
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if not math.isclose(cfg_value, 1.0):
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noise_pred_neg = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[negative_cond],
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x,
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timestep,
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model_options,
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)[0]
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if not math.isclose(stg_scale, 0.0):
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try:
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model_options["transformer_options"]["ptb_index"] = 0
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self.stg_flag.do_skip = True
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noise_pred_perturbed = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[positive_cond],
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x,
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timestep,
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model_options,
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)[0]
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finally:
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self.stg_flag.do_skip = False
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del model_options["transformer_options"]["ptb_index"]
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stg_result = stg(
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noise_pred_pos,
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noise_pred_neg,
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noise_pred_perturbed,
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cfg_value,
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stg_scale,
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stg_rescale,
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)
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# normally this would be done in cfg_function, but we skipped
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# that for efficiency: we can compute the noise predictions in
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# a single call to calc_cond_batch() (rather than two)
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# so we replicate the hook here
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for fn in model_options.get("sampler_post_cfg_function", []):
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args = {
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"denoised": stg_result,
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"cond": positive_cond,
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"uncond": negative_cond,
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"model": self.inner_model,
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"uncond_denoised": noise_pred_neg,
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"cond_denoised": noise_pred_pos,
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"sigma": timestep,
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"model_options": model_options,
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"input": x,
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# not in the original call in samplers.py:cfg_function, but made available for future hooks
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"perturbed_cond": positive_cond,
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"perturbed_cond_denoised": noise_pred_perturbed,
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}
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stg_result = fn(args)
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return stg_result
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class STGGuiderAdvanced(comfy.samplers.CFGGuider):
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def __init__(
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self,
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model: ModelPatcher,
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sigma_list,
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cfg_list,
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stg_scale_list,
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stg_rescale_list,
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stg_layers_indices_list,
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skip_steps_sigma_threshold,
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cfg_star_rescale,
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):
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model = model.clone()
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super().__init__(model)
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self.stg_flag = STGFlag(
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do_skip=False,
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skip_layers=model.model_options["transformer_options"].get(
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"skip_block_list"
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),
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)
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self.sigma_list = sigma_list
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self.cfg_list = cfg_list
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self.stg_scale_list = stg_scale_list
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self.stg_rescale_list = stg_rescale_list
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self.stg_layers_indices_list = stg_layers_indices_list
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self.skip_steps_sigma_threshold = skip_steps_sigma_threshold
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self.cfg_star_rescale = cfg_star_rescale
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STGGuider.patch_model(model, self.stg_flag)
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def sigma_to_params_mapping(self, sigma):
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# Find the closest higher sigma value and return corresponding cfg
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higher_sigmas = [s for s in self.sigma_list if s >= sigma]
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if not higher_sigmas:
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closest_idx = -1 # Return last cfg if no higher sigma exists
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else:
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closest_higher = min(higher_sigmas)
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closest_idx = self.sigma_list.index(closest_higher)
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return (
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self.cfg_list[closest_idx],
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self.stg_scale_list[closest_idx],
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self.stg_rescale_list[closest_idx],
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self.stg_layers_indices_list[closest_idx],
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)
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def set_conds(self, positive, negative):
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self.inner_set_conds({"positive": positive, "negative": negative})
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def predict_noise(
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self,
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x: torch.Tensor,
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timestep: torch.Tensor,
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model_options: dict = {},
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seed=None,
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):
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# CFG zero init - skipping steps with timestep bigger than given threshold.
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if timestep > self.skip_steps_sigma_threshold:
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return torch.zeros_like(x)
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# in CFGGuider.predict_noise, we call sampling_function(), which uses cfg_function() to compute pos & neg
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# but we'd rather do a single batch of sampling pos, neg, and perturbed, so we call calc_cond_batch([perturbed,pos,neg]) directly
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positive_cond = self.conds.get("positive", None)
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negative_cond = self.conds.get("negative", None)
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cfg_value, stg_scale, stg_rescale, stg_layer_skip_layer_indices = (
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self.sigma_to_params_mapping(timestep)
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)
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if stg_layer_skip_layer_indices is not None:
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self.stg_flag.skip_layers = stg_layer_skip_layer_indices
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STGGuider.patch_model(self.model_patcher, self.stg_flag)
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noise_pred_pos = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[positive_cond],
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x,
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timestep,
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model_options,
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)[0]
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noise_pred_neg = 0
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noise_pred_perturbed = 0
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if not math.isclose(cfg_value, 1.0):
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noise_pred_neg = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[negative_cond],
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x,
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timestep,
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model_options,
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)[0]
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if self.cfg_star_rescale:
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batch_size = noise_pred_pos.shape[0]
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positive_flat = noise_pred_pos.view(batch_size, -1)
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negative_flat = noise_pred_neg.view(batch_size, -1)
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dot_product = torch.sum(
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positive_flat * negative_flat, dim=1, keepdim=True
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)
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squared_norm = torch.sum(negative_flat**2, dim=1, keepdim=True) + 1e-8
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alpha = dot_product / squared_norm
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noise_pred_neg = alpha * noise_pred_neg
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if not math.isclose(stg_scale, 0.0):
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try:
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model_options["transformer_options"]["ptb_index"] = 0
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self.stg_flag.do_skip = True
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noise_pred_perturbed = comfy.samplers.calc_cond_batch(
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self.inner_model,
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[positive_cond],
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x,
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timestep,
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model_options,
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)[0]
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finally:
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self.stg_flag.do_skip = False
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del model_options["transformer_options"]["ptb_index"]
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stg_result = stg(
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noise_pred_pos,
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noise_pred_neg,
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noise_pred_perturbed,
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cfg_value,
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stg_scale,
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stg_rescale,
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)
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# normally this would be done in cfg_function, but we skipped
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# that for efficiency: we can compute the noise predictions in
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# a single call to calc_cond_batch() (rather than two)
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# so we replicate the hook here
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for fn in model_options.get("sampler_post_cfg_function", []):
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args = {
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"denoised": stg_result,
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"cond": positive_cond,
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"uncond": negative_cond,
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"model": self.inner_model,
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"uncond_denoised": noise_pred_neg,
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"cond_denoised": noise_pred_pos,
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"sigma": timestep,
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"model_options": model_options,
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"input": x,
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# not in the original call in samplers.py:cfg_function, but made available for future hooks
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"perturbed_cond": positive_cond,
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"perturbed_cond_denoised": noise_pred_perturbed,
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}
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stg_result = fn(args)
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return stg_result
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@comfy_node(name="STGGuider")
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class STGGuiderNode:
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"model": ("MODEL",),
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"positive": ("CONDITIONING",),
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"negative": ("CONDITIONING",),
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"cfg": (
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"FLOAT",
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{
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"default": 1.0,
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"min": 0.0,
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"max": 100.0,
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"step": 0.1,
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"round": 0.01,
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},
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),
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"stg": (
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"FLOAT",
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{"default": 1.0, "min": 0.0, "max": 100.0, "step": 0.01},
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),
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"rescale": (
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"FLOAT",
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{"default": 0.7, "min": 0.0, "max": 1.0, "step": 0.01},
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),
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}
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}
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RETURN_TYPES = ("GUIDER",)
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FUNCTION = "get_guider"
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CATEGORY = "lightricks/LTXV"
|
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|
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DESCRIPTION = (
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"Implements Spatiotemporal Skip Guidance (STG), a training-free method enhancing transformer-based "
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"video diffusion models by selectively skipping layers during sampling. This approach improves video "
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"quality without sacrificing diversity or motion fidelity."
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"Reference: https://arxiv.org/abs/2411.18664."
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)
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def get_guider(self, model, positive, negative, cfg, stg, rescale):
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guider = STGGuider(model, cfg, stg, rescale)
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guider.set_conds(positive, negative)
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return (guider,)
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|
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def load_stg_presets():
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preset_file_path = os.path.join(
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os.path.dirname(__file__), "presets", "stg_advanced_presets.json"
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)
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if os.path.exists(preset_file_path):
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presets = json.load(open(preset_file_path))
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preset_names = [preset["name"] for preset in presets]
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else:
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presets = []
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preset_names = ["Custom"]
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return presets, preset_names
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|
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STG_ADVANCED_PRESETS, STG_ADVANCED_PRESET_NAMES = load_stg_presets()
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|
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@comfy_node(name="STGGuiderAdvanced")
|
|
class STGGuiderAdvancedNode:
|
|
@classmethod
|
|
def INPUT_TYPES(s):
|
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return {
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"required": {
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"model": ("MODEL",),
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"positive": ("CONDITIONING",),
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"negative": ("CONDITIONING",),
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"skip_steps_sigma_threshold": (
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"FLOAT",
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{
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"default": 0.998,
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"min": 0.0,
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"max": 100.0,
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"step": 0.001,
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"tooltip": "Steps with sigma greater than this values will be skipped.",
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},
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),
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"cfg_star_rescale": (
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"BOOLEAN",
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{
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"default": True,
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"tooltip": "If true, applies the cfg star rescale, scales the negative prediction according to dot product between positive and negative.",
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},
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),
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"sigmas": (
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"STRING",
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{
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"default": "1.0, 0.9933, 0.9850, 0.9767, 0.9008, 0.6180",
|
|
"tooltip": "Comma-separated list sigmas, the actual parameters will be selected according to the closest sigma from this list to current timestep sigma.",
|
|
},
|
|
),
|
|
"cfg_values": (
|
|
"STRING",
|
|
{
|
|
"default": "8, 6, 6, 4, 3, 1",
|
|
"tooltip": "Comma-separated list of cfg values. Should be same length as sigmas list.",
|
|
},
|
|
),
|
|
"stg_scale_values": (
|
|
"STRING",
|
|
{
|
|
"default": "4, 4, 3, 2, 1, 0",
|
|
"tooltip": "Comma-separated list of stg scale values. Should be same length as sigmas list.",
|
|
},
|
|
),
|
|
"stg_rescale_values": (
|
|
"STRING",
|
|
{
|
|
"default": "1, 1, 1, 1, 1, 1",
|
|
"tooltip": "Comma-separated list of stg rescale values. Should be same length as sigmas list.",
|
|
},
|
|
),
|
|
"stg_layers_indices": (
|
|
"STRING",
|
|
{
|
|
"default": "[29], [29], [29], [29], [29], [29]",
|
|
"tooltip": "Comma-separated list of list of layer indices. Should be same length as sigmas list.",
|
|
},
|
|
),
|
|
},
|
|
"optional": {
|
|
"preset": (
|
|
"STG_ADVANCED_PRESET",
|
|
{
|
|
"tooltip": "Preset resolution and frame count. Custom allows manual input.",
|
|
},
|
|
),
|
|
},
|
|
}
|
|
|
|
RETURN_TYPES = ("GUIDER",)
|
|
|
|
FUNCTION = "get_guider"
|
|
CATEGORY = "lightricks/LTXV"
|
|
DESCRIPTION = """
|
|
The Advanced STG Guider implements sophisticated techniques for controlling the denoising process:
|
|
|
|
It creates a dynamic mapping from scheduler-defined sigma values to CFG and STG (Spatio-Temporal Skip Guidance [1]) parameters.
|
|
This approach establishes distinct sigma value ranges that operate independently of step numbers, allowing precise control over:
|
|
• CFG scale
|
|
• STG scale and rescale factors
|
|
• STG attention layer skipping patterns
|
|
|
|
The guider also supports:
|
|
• CFG-Zero* [2] rescaling, which dynamically adjusts negative predictions based on the dot product between positive and negative signals
|
|
• Threshold-based noise prediction zeroing for steps with sigma values exceeding a specified threshold
|
|
|
|
For example if the sigma ranges are defined as [1.0, 0.9, 0.85, 0.6] and the CFG values are defined as [4, 3, 2, 1] and STG scale values
|
|
are defined as [2, 2, 2, 1] and STG rescale values are defined as [1, 1, 1, 1] and STG layers indices are defined as [[14, 17], [14, 16], [14], [14]], then the guider will:
|
|
- use CFG=4, STG scale=2, STG rescale=1 and STG layers indices = [14, 17] for sigma in the range (0.9, 1.0]
|
|
- use CFG=3, STG scale=2, STG rescale=1 and STG layers indices = [14, 16] for sigma in the range (0.85, 0.9]
|
|
- use CFG=2, STG scale=2, STG rescale=1 and STG layers indices = [14] for sigma in the range (0.8, 0.85]
|
|
- use CFG=1, STG scale=1, STG rescale=1 and STG layers indices = [14] for sigma in the range (0.6, 0.8]
|
|
|
|
The guider will use the same parameters for the same sigma values, regardless of the step number.
|
|
|
|
References:
|
|
[1] https://arxiv.org/abs/2411.18664
|
|
[2] https://arxiv.org/abs/2503.18886
|
|
|
|
"""
|
|
|
|
@classmethod
|
|
def parse_stg_layers_indices(cls, stg_layers_indices: str) -> List[List[int]]:
|
|
# First split by "], " to separate the lists, but preserve the closing bracket
|
|
lists = [s + "]" for s in stg_layers_indices.split("],")[:-1]]
|
|
# Add the last list which already has its closing bracket
|
|
if stg_layers_indices.strip():
|
|
lists.append(stg_layers_indices.split("],")[-1])
|
|
|
|
result = []
|
|
for s in lists:
|
|
s = s.strip()
|
|
if s == "[]": # Empty list case
|
|
result.append([])
|
|
else:
|
|
# Remove brackets and whitespace
|
|
s = s.strip("[]").strip()
|
|
if not s: # Handle case like "[]" after split
|
|
result.append([])
|
|
else:
|
|
# Split by comma and convert to integers
|
|
numbers = [int(n.strip()) for n in s.split(",") if n.strip()]
|
|
result.append(numbers)
|
|
|
|
return result
|
|
|
|
def get_guider(
|
|
self,
|
|
model,
|
|
positive,
|
|
negative,
|
|
skip_steps_sigma_threshold,
|
|
cfg_star_rescale,
|
|
sigmas,
|
|
cfg_values,
|
|
stg_scale_values,
|
|
stg_rescale_values,
|
|
stg_layers_indices,
|
|
preset=None,
|
|
):
|
|
if preset and preset != "Custom":
|
|
preset_data = next(
|
|
(item for item in STG_ADVANCED_PRESETS if item["name"] == preset), None
|
|
)
|
|
if preset_data:
|
|
skip_steps_sigma_threshold = preset_data["skip_steps_sigma_threshold"]
|
|
cfg_star_rescale = preset_data["cfg_star_rescale"]
|
|
sigma_list = preset_data["sigmas"]
|
|
cfg_list = preset_data["cfg_values"]
|
|
stg_scale_list = preset_data["stg_scale_values"]
|
|
stg_rescale_list = preset_data["stg_rescale_values"]
|
|
stg_layers_indices_list = preset_data["stg_layers_indices"]
|
|
else:
|
|
raise ValueError(f"Preset {preset} not found in the presets list.")
|
|
|
|
else:
|
|
sigma_list = [float(s.strip()) for s in sigmas.split(",")]
|
|
cfg_list = [float(c.strip()) for c in cfg_values.split(",")]
|
|
stg_scale_list = [float(s.strip()) for s in stg_scale_values.split(",")]
|
|
stg_rescale_list = [float(s.strip()) for s in stg_rescale_values.split(",")]
|
|
stg_layers_indices_list = self.parse_stg_layers_indices(stg_layers_indices)
|
|
print("Using preset: ", preset)
|
|
print("Skip steps sigma threshold: ", skip_steps_sigma_threshold)
|
|
print("Cfg star rescale: ", cfg_star_rescale)
|
|
print("Sigma list: ", sigma_list)
|
|
print("Cfg list: ", cfg_list)
|
|
print("Stg scale list: ", stg_scale_list)
|
|
print("Stg rescale list: ", stg_rescale_list)
|
|
print("Stg layers indices list: ", stg_layers_indices_list)
|
|
|
|
guider = STGGuiderAdvanced(
|
|
model,
|
|
sigma_list,
|
|
cfg_list,
|
|
stg_scale_list,
|
|
stg_rescale_list,
|
|
stg_layers_indices_list,
|
|
skip_steps_sigma_threshold,
|
|
cfg_star_rescale,
|
|
)
|
|
guider.set_conds(positive, negative)
|
|
guider.raw_conds = (positive, negative)
|
|
return (guider,)
|
|
|
|
|
|
@comfy_node(name="STGAdvancedPresets")
|
|
class STGAdvancedPresetsNode:
|
|
@classmethod
|
|
def INPUT_TYPES(s):
|
|
return {
|
|
"required": {
|
|
"preset": (
|
|
STG_ADVANCED_PRESET_NAMES,
|
|
{
|
|
"default": "13b Balanced",
|
|
"tooltip": "Preset resolution and frame count. Custom allows manual input.",
|
|
},
|
|
),
|
|
},
|
|
}
|
|
|
|
RETURN_TYPES = ("STG_ADVANCED_PRESET",)
|
|
|
|
FUNCTION = "get_preset"
|
|
CATEGORY = "lightricks/LTXV"
|
|
|
|
def get_preset(self, preset=None):
|
|
return (preset,)
|