544 lines
22 KiB
Python
544 lines
22 KiB
Python
"""Shared machinery for the dual-schedule sampler (MiniMax H3)."""
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import copy
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from functools import partial
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import logging
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import math
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from comfy.k_diffusion import sampling as k_diffusion_sampling
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import comfy.model_sampling
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import comfy.samplers
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from comfy_api.latest import io
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import torch
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from tqdm.auto import trange
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# Video cannot run at sigma 0 because the model's noise mapping fixes 0, which would
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# pin audio to 0 as well. Running a frozen video at a constant epsilon leaves it
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# practically clean while keeping the audio mapping solvable.
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FROZEN_VIDEO_SIGMA = 0.0001
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# DPM++ SDE's midpoint position. Core exposes it as a widget; this node does not, so the
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# general (1 - fac)/fac blend below collapses to denoised_2 - it is kept in that form to
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# stay diffable against comfy.k_diffusion.sampling.sample_dpmpp_sde.
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DPMPP_SDE_R = 0.5
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# A socket of its own, so a stock SAMPLER cannot be wired into a dual sampling node.
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DualSamplerType = io.Custom("DUAL_SAMPLER")
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def audio_shift_for(sigma_v, sigma_a):
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"""The to_shift that makes time_shift_sigma(sigma_v, 1.0, to_shift) == sigma_a.
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With from_shift 1.0 the model's inversion is the identity, so its mapping reduces to
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sigma_a = to*sigma_v / (1 + (to-1)*sigma_v), which inverts in closed form. The mapping
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fixes sigma = 1, which check_schedules rejects, so the guard here is only numerical.
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"""
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if sigma_v >= 1.0 or sigma_a >= 1.0:
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return 1.0
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return sigma_a * (1.0 - sigma_v) / (sigma_v * (1.0 - sigma_a))
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def is_frozen(sigmas):
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"""An all-zero schedule means: leave this stream alone, it is already x0."""
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return bool((sigmas == 0).all())
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def check_schedules(video_sigmas, audio_sigmas):
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"""Reject the two schedule pairings that cannot be sampled. Nothing is rewritten."""
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if video_sigmas.shape[-1] != audio_sigmas.shape[-1]:
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raise ValueError(
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"video_sigmas and audio_sigmas must have the same number of steps, got {} and {}.".format(
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video_sigmas.shape[-1], audio_sigmas.shape[-1]
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)
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)
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# n sigmas are n - 1 steps, so two is the shortest real schedule ([1.0, 0.0] is one
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# step and samples fine). One sigma describes a noise level and no step to take from
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# it, which would otherwise surface as a bare StopIteration out of the driver.
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if video_sigmas.shape[-1] < 2:
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raise ValueError(
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"A sigma schedule needs at least two values, which is one step, got {}. Use [1.0, 0.0] for a single step.".format(
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video_sigmas.shape[-1]
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)
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)
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# The model maps between the two streams' noise levels with a transform that fixes 1.0,
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# so at 1.0 both streams are pinned together and the other one cannot be expressed.
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first_v, first_a = float(video_sigmas[0]), float(audio_sigmas[0])
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if first_v >= 1.0 and first_a < 1.0:
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raise ValueError(
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"Video sigma starts at 1.0 while the audio sigma is less than 1 ({:g}). Use 0.9999 for the first video sigma.".format(
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first_a
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)
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)
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if first_a >= 1.0 and first_v < 1.0:
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raise ValueError(
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"Audio sigma starts at 1.0 while the video sigma is less than 1 ({:g}). Use 0.9999 for the first audio sigma.".format(
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first_v
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)
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)
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def ancestral_stream(x, sigmas, o):
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"""Ancestral Euler over one stream, mirroring core's sample_euler_ancestral_RF.
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A coroutine: it yields (step, sigma, x) to ask for this stream's x0 estimate at that
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noise level and receives it back. The driver pairs both streams' requests into a single
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DiT forward, which is what lets the two run on independent schedules. eta 0 makes it
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plain Euler.
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"""
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for i in range(len(sigmas) - 1):
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denoised = yield (i, sigmas[i], x)
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if sigmas[i + 1] == 0:
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x = denoised
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continue
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downstep_ratio = 1 + (sigmas[i + 1] / sigmas[i] - 1) * o.eta
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sigma_down = sigmas[i + 1] * downstep_ratio
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alpha_ip1 = 1 - sigmas[i + 1]
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alpha_down = 1 - sigma_down
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renoise_coeff = (
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sigmas[i + 1] ** 2 - sigma_down**2 * alpha_ip1**2 / alpha_down**2
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) ** 0.5
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sigma_down_i_ratio = sigma_down / sigmas[i]
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x = sigma_down_i_ratio * x + (1 - sigma_down_i_ratio) * denoised
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if o.eta > 0:
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x = (alpha_ip1 / alpha_down) * x + o.noise(
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sigmas[i], sigmas[i + 1]
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) * o.s_noise * renoise_coeff
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return x
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def dpmpp_sde_stream(x, sigmas, o):
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"""DPM-Solver++ (stochastic) over one stream, mirroring core's sample_dpmpp_sde.
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Two model evaluations per step: one at sigmas[i], then a midpoint one at sigma_s_1 that
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is yielded with a step index of None so it does not tick the progress bar. A terminal
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step (sigma_next 0) costs only the first.
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The logSNR of a flow model is log((1 - sigma) / sigma), which is -inf at sigma 1, so the
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first sigma is nudged off 1.0 the way core does. That happens on the local copy only -
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the initial noise_scaling has already run against the schedule as the user wrote it,
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which is the same split core makes between KSAMPLER.sample and the sampler function.
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"""
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sigmas = k_diffusion_sampling.offset_first_sigma_for_snr(
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sigmas, o.model_sampling
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)
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sigma_fn = partial(
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k_diffusion_sampling.half_log_snr_to_sigma, model_sampling=o.model_sampling
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)
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lambda_fn = partial(
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k_diffusion_sampling.sigma_to_half_log_snr, model_sampling=o.model_sampling
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)
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for i in range(len(sigmas) - 1):
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denoised = yield (i, sigmas[i], x)
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if sigmas[i + 1] == 0:
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x = denoised
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continue
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lambda_s, lambda_t = lambda_fn(sigmas[i]), lambda_fn(sigmas[i + 1])
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h = lambda_t - lambda_s
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lambda_s_1 = lambda_s + DPMPP_SDE_R * h
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fac = 1 / (2 * DPMPP_SDE_R)
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sigma_s_1 = sigma_fn(lambda_s_1)
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# for a flow model exp(lambda) is (1 - sigma) / sigma, so these are the RF alphas
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alpha_s = sigmas[i] * lambda_s.exp()
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alpha_s_1 = sigma_s_1 * lambda_s_1.exp()
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alpha_t = sigmas[i + 1] * lambda_t.exp()
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# Step 1. get_ancestral_step takes exp(-lambda), the variance-preserving sigma, not
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# the flow sigma - the noise split is computed in that parameterisation.
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sd, su = k_diffusion_sampling.get_ancestral_step(
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lambda_s.neg().exp(), lambda_s_1.neg().exp(), o.eta
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)
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lambda_s_1_ = sd.log().neg()
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h_ = lambda_s_1_ - lambda_s
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x_2 = (alpha_s_1 / alpha_s) * (-h_).exp() * x - alpha_s_1 * (
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-h_
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).expm1() * denoised
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if o.eta > 0 and o.s_noise > 0:
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x_2 = x_2 + alpha_s_1 * o.noise(sigmas[i], sigma_s_1) * o.s_noise * su
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denoised_2 = yield (None, sigma_s_1, x_2)
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# Step 2
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sd, su = k_diffusion_sampling.get_ancestral_step(
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lambda_s.neg().exp(), lambda_t.neg().exp(), o.eta
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)
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lambda_t_ = sd.log().neg()
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h_ = lambda_t_ - lambda_s
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denoised_d = (1 - fac) * denoised + fac * denoised_2
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x = (alpha_t / alpha_s) * (-h_).exp() * x - alpha_t * (
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-h_
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).expm1() * denoised_d
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if o.eta > 0 and o.s_noise > 0:
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x = x + alpha_t * o.noise(sigmas[i], sigmas[i + 1]) * o.s_noise * su
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return x
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def brownian_noise(x, sigmas, seed, cpu):
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"""A torchsde Brownian path over one stream's own schedule.
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An SDE solver draws twice inside a step and both draws have to come off the same path,
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so the independent draw ancestral_stream uses will not do. Indexing the path by this
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stream's sigmas rather than the video's is what makes the audio stream's solver
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self-consistent when the two schedules differ.
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"""
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positive = sigmas[sigmas > 0]
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if positive.numel() == 0 or float(positive.min()) == float(sigmas.max()):
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# A constant schedule - the frozen-video path - leaves the tree no interval to span.
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# Nothing rides on the draw: a constant schedule's ancestral split is 0 at every
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# step, so whatever comes back is multiplied by zero.
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return k_diffusion_sampling.default_noise_sampler(x, seed=seed)
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return k_diffusion_sampling.BrownianTreeNoiseSampler(
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x, positive.min(), sigmas.max(), seed=seed, cpu=cpu
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)
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class StreamOptions:
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"""Per-stream knobs and noise source handed to the sampler coroutine."""
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def __init__(self, eta, s_noise, noise, model_sampling):
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self.eta, self.s_noise, self.noise = eta, s_noise, noise
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self.model_sampling = model_sampling
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class DualSampler(comfy.samplers.Sampler):
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"""Steps a packed [video, audio] latent on two independent sigma schedules.
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The video schedule arrives through the normal `sigmas` argument; the audio schedule and
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the audio stream's seed are attached by DualSamplerCustomAdvanced via
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with_audio_sigmas().
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stream_fn selects the algorithm both streams are stepped with. noise_device picks where
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the SDE solvers build their Brownian path, and doubles as the flag for needing one at
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all: None means the algorithm is happy with independent draws.
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"""
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def __init__(
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self,
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eta_video=1.0,
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eta_audio=1.0,
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s_noise_video=1.0,
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s_noise_audio=1.0,
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stream_fn=ancestral_stream,
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noise_device=None,
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):
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self.eta_video = eta_video
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self.eta_audio = eta_audio
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self.s_noise_video = s_noise_video
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self.s_noise_audio = s_noise_audio
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self.stream_fn = stream_fn
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self.noise_device = noise_device
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self.audio_sigmas = None
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self.audio_seed = None
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def with_audio_sigmas(self, audio_sigmas, audio_seed=None):
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sampler = copy.copy(self)
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sampler.audio_sigmas = audio_sigmas
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sampler.audio_seed = audio_seed
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return sampler
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def stream_options(self, x, split, video, seed, model_sampling, sigmas):
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"""Noise source and knobs for one stream.
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Without a noise device the sampler is built on the *packed* shape and sliced, so
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with equal schedules the two streams draw exactly the tensor core's single sampler
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would have drawn. With one, each stream gets its own Brownian path over its own
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schedule instead, which is what an SDE solver needs.
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"""
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region = slice(None, split) if video else slice(split, None)
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if self.noise_device is None:
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draw = k_diffusion_sampling.default_noise_sampler(x, seed=seed)
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def noise(a, b):
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return draw(a, b)[..., region]
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else:
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# a path of its own per stream, so the audio solver is not steered by the video
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# seed; the sliced path above stays on one seed to keep its core parity
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if not video and self.audio_seed is not None:
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seed = self.audio_seed
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noise = brownian_noise(
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x[..., region], sigmas, seed, self.noise_device == "cpu"
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)
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noise_scale = getattr(model_sampling, "noise_scale", 1.0)
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return StreamOptions(
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eta=self.eta_video if video else self.eta_audio,
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s_noise=(self.s_noise_video if video else self.s_noise_audio)
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* noise_scale,
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noise=noise,
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model_sampling=model_sampling,
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)
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def sample(
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self,
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model_wrap,
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sigmas,
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extra_args,
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callback,
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noise,
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latent_image=None,
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denoise_mask=None,
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disable_pbar=False,
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):
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if self.audio_sigmas is None:
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raise ValueError(
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"A dual sampler needs both schedules: connect it to DualSamplerCustomAdvanced, not SamplerCustomAdvanced."
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)
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inner_model = model_wrap.inner_model
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model_sampling = inner_model.model_sampling
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if not isinstance(model_sampling, comfy.model_sampling.CONST):
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raise ValueError(
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"The dual sampler only supports rectified flow (CONST) models such as MiniMax H3."
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)
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# The shifts on the guider's model are irrelevant here - this node overrides both per
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# step and drives the streams from the input sigmas. The multiplier is not: it is the
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# timestep scale the model is called on, and the H3 DiT reads sigma back as
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# timestep/1000. ModelSamplingAuraFlow patches at multiplier 1.0, which the stock path
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# rejects for other reasons but this one would otherwise run 1000x off in silence.
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multiplier = getattr(model_sampling, "multiplier", None)
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if multiplier != 1000:
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raise ValueError(
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"The guider's model is patched at timestep multiplier {} instead of 1000, so the DiT would read every sigma too small. Use ModelSamplingMiniMaxH3 or ModelSamplingSD3 on the guider and keep AuraFlow on a separate branch feeding BasicScheduler.".format(
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multiplier
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)
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)
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latent_shapes = inner_model.latent_shapes
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if latent_shapes is None or len(latent_shapes) < 2:
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raise ValueError(
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"DualSamplerCustomAdvanced needs a packed audio-video latent (two streams), got one stream."
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)
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# pack_latents lays the streams out flat and in order: video first, then audio
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split = math.prod(latent_shapes[0][1:])
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video_sigmas = sigmas
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audio_sigmas = self.audio_sigmas.to(
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device=video_sigmas.device, dtype=video_sigmas.dtype
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)
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model_options = extra_args.get("model_options", {})
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# a per-sample deep clone, so per-step writes stay local to this run
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transformer_options = model_options.setdefault(
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"transformer_options", {}
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)
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transformer_options["sample_sigmas_audio"] = audio_sigmas
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seed = extra_args.get("seed", None)
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check_schedules(video_sigmas, audio_sigmas)
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total_steps = len(video_sigmas) - 1
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# an all-zero schedule freezes its stream: the latent is already x0, so it is never
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# stepped and the DiT is told t = 1 (clean) for it every pass
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frozen_v, frozen_a = is_frozen(video_sigmas), is_frozen(audio_sigmas)
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if frozen_v and frozen_a:
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raise ValueError(
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"both schedules are all zeros, so there is nothing to sample."
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)
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if frozen_v:
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# audio_shift_for cannot solve against a video sigma of 0 - the model's mapping
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# fixes 0, so the audio would be pinned there too. A constant epsilon leaves the
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# video untouched and keeps the mapping solvable.
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logging.info(
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"Received an all-zero video schedule, running it at a constant %g instead.",
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FROZEN_VIDEO_SIGMA,
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)
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video_sigmas = torch.full_like(video_sigmas, FROZEN_VIDEO_SIGMA)
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frozen_v = False
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# each stream is brought up to its own first sigma, so the two can start anywhere
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x = torch.empty_like(noise)
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x[..., :split] = model_sampling.noise_scaling(
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video_sigmas[0],
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noise[..., :split],
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latent_image[..., :split],
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self.max_denoise(model_wrap, video_sigmas),
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)
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x[..., split:] = model_sampling.noise_scaling(
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audio_sigmas[0],
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noise[..., split:],
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latent_image[..., split:],
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self.max_denoise(model_wrap, audio_sigmas),
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)
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s_in = x.new_ones([x.shape[0]])
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# Where a stream sits while it is not being stepped: a frozen one never moves, a
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# finished one waits at its last sigma for the other to catch up. Audio at 0 reads
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# as clean to the model, which is what a frozen audio stream wants; video at 0 does
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# not, since audio_shift_for cannot solve against it, so video holds at
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# FROZEN_VIDEO_SIGMA for the same reason the frozen video path does.
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held_v, held_a = x[..., :split], x[..., split:]
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held_sigma_v, held_sigma_a = FROZEN_VIDEO_SIGMA, 0.0
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# a frozen stream is never stepped, so it needs no noise source
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opts_v = (
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None
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if frozen_v
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else self.stream_options(
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x, split, True, seed, model_sampling, video_sigmas
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)
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)
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opts_a = (
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None
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if frozen_a
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else self.stream_options(
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x, split, False, seed, model_sampling, audio_sigmas
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)
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)
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gen_v = (
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None if frozen_v else self.stream_fn(held_v, video_sigmas, opts_v)
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)
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gen_a = (
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None if frozen_a else self.stream_fn(held_a, audio_sigmas, opts_a)
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)
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progress = trange(total_steps, disable=disable_pbar)
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req_v = next(gen_v) if gen_v is not None else None
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req_a = next(gen_a) if gen_a is not None else None
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done_v = held_v if frozen_v else None
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done_a = held_a if frozen_a else None
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while True:
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# a substep carries no step index; take the first real one on offer, so a
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# stream mid-step does not swallow the other's finished step
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step = next(
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(
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req[0]
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for req in (req_v, req_a)
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if req is not None and req[0] is not None
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),
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None,
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)
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sigma_v, xv = (
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(req_v[1], req_v[2])
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if req_v is not None
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else (held_sigma_v, held_v)
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)
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sigma_a, xa = (
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(req_a[1], req_a[2])
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if req_a is not None
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else (held_sigma_a, held_a)
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)
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sigma_v, sigma_a = float(sigma_v), float(sigma_a)
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x = torch.cat([xv, xa], dim=-1)
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x_in = x
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if denoise_mask is not None:
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x_in = self.apply_mask(
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inner_model,
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x,
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noise,
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latent_image,
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denoise_mask,
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sigma_v,
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sigma_a,
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split,
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model_options,
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)
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# the model derives the audio timestep from the video sigma and the two flow
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# shifts; pinning the video shift to 1.0 makes that mapping solvable for the
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# audio shift that reproduces this evaluation's audio sigma exactly
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transformer_options["minimax_h3_sigma_shift_video"] = 1.0
|
|
transformer_options["minimax_h3_sigma_shift_audio"] = (
|
|
audio_shift_for(sigma_v, sigma_a)
|
|
)
|
|
denoised = model_wrap(
|
|
x_in, s_in * sigma_v, model_options=model_options, seed=seed
|
|
)
|
|
|
|
# calculate_denoised applied the video sigma to the whole pack; recover the
|
|
# velocity and re-solve the audio stream's x0 at its own sigma
|
|
velocity = (x_in - denoised) / sigma_v
|
|
denoised = torch.cat(
|
|
[
|
|
denoised[..., :split],
|
|
x_in[..., split:] - velocity[..., split:] * sigma_a,
|
|
],
|
|
dim=-1,
|
|
)
|
|
|
|
if denoise_mask is not None:
|
|
denoised = denoised * denoise_mask + latent_image * (
|
|
1.0 - denoise_mask
|
|
)
|
|
|
|
if step is not None:
|
|
if callback is not None:
|
|
# Sampler.sample gets ComfyUI's callback directly, not k-diffusion's dict form
|
|
callback(step, denoised, x, total_steps)
|
|
progress.update(1)
|
|
|
|
# a stream that runs out first is pinned where it landed and keeps conditioning
|
|
# the other; only when both are done does the loop end
|
|
if req_v is not None:
|
|
try:
|
|
req_v = gen_v.send(denoised[..., :split])
|
|
except StopIteration as stop:
|
|
req_v, done_v = None, stop.value
|
|
held_v = done_v
|
|
last_v = float(video_sigmas[-1])
|
|
held_sigma_v = max(last_v, FROZEN_VIDEO_SIGMA)
|
|
if req_a is not None:
|
|
try:
|
|
req_a = gen_a.send(denoised[..., split:])
|
|
except StopIteration as stop:
|
|
req_a, done_a = None, stop.value
|
|
held_a = done_a
|
|
held_sigma_a = float(audio_sigmas[-1])
|
|
if req_v is None and req_a is None:
|
|
break
|
|
progress.close()
|
|
|
|
return torch.cat(
|
|
[
|
|
model_sampling.inverse_noise_scaling(video_sigmas[-1], done_v),
|
|
model_sampling.inverse_noise_scaling(audio_sigmas[-1], done_a),
|
|
],
|
|
dim=-1,
|
|
)
|
|
|
|
def apply_mask(
|
|
self,
|
|
inner_model,
|
|
x,
|
|
noise,
|
|
latent_image,
|
|
denoise_mask,
|
|
sigma_v,
|
|
sigma_a,
|
|
split,
|
|
model_options,
|
|
):
|
|
"""KSamplerX0Inpaint's masked blend, with each stream pinned at its own sigma."""
|
|
if "denoise_mask_function" in model_options:
|
|
denoise_mask = model_options["denoise_mask_function"](
|
|
sigma_v,
|
|
denoise_mask,
|
|
extra_options={
|
|
"model": inner_model,
|
|
"sigmas": self.audio_sigmas,
|
|
},
|
|
)
|
|
latent_mask = 1.0 - denoise_mask
|
|
pinned = torch.cat(
|
|
[
|
|
inner_model.scale_latent_inpaint(
|
|
x=x[..., :split],
|
|
sigma=x.new_tensor([sigma_v]),
|
|
noise=noise[..., :split],
|
|
latent_image=latent_image[..., :split],
|
|
),
|
|
inner_model.scale_latent_inpaint(
|
|
x=x[..., split:],
|
|
sigma=x.new_tensor([sigma_a]),
|
|
noise=noise[..., split:],
|
|
latent_image=latent_image[..., split:],
|
|
),
|
|
],
|
|
dim=-1,
|
|
)
|
|
return x * denoise_mask + pinned * latent_mask
|