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Refactor sampler code for more advanced sampler nodes part 2.

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comfyanonymous
2024-04-04 00:48:42 -04:00
parent 57753c964a
commit 0542088ef8
3 changed files with 165 additions and 143 deletions
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130
comfy/samplers.py
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@@ -5,6 +5,7 @@ import collections
from comfy import model_management
import math
import logging
import comfy.sampler_helpers
def get_area_and_mult(conds, x_in, timestep_in):
area = (x_in.shape[2], x_in.shape[3], 0, 0)
@@ -230,58 +231,45 @@ def calc_cond_uncond_batch(model, cond, uncond, x_in, timestep, model_options):
logging.warning("WARNING: The comfy.samplers.calc_cond_uncond_batch function is deprecated please use the calc_cond_batch one instead.")
return tuple(calc_cond_batch(model, [cond, uncond], x_in, timestep, model_options))
def cfg_function(model, cond_pred, uncond_pred, cond_scale, x, timestep, model_options={}):
if "sampler_cfg_function" in model_options:
args = {"cond": x - cond_pred, "uncond": x - uncond_pred, "cond_scale": cond_scale, "timestep": timestep, "input": x, "sigma": timestep,
"cond_denoised": cond_pred, "uncond_denoised": uncond_pred, "model": model, "model_options": model_options}
cfg_result = x - model_options["sampler_cfg_function"](args)
else:
cfg_result = uncond_pred + (cond_pred - uncond_pred) * cond_scale
for fn in model_options.get("sampler_post_cfg_function", []):
args = {"denoised": cfg_result, "cond": cond, "uncond": uncond, "model": model, "uncond_denoised": uncond_pred, "cond_denoised": cond_pred,
"sigma": timestep, "model_options": model_options, "input": x}
cfg_result = fn(args)
return cfg_result
#The main sampling function shared by all the samplers
#Returns denoised
def sampling_function(model, x, timestep, uncond, cond, cond_scale, model_options={}, seed=None):
if math.isclose(cond_scale, 1.0) and model_options.get("disable_cfg1_optimization", False) == False:
uncond_ = None
else:
uncond_ = uncond
if math.isclose(cond_scale, 1.0) and model_options.get("disable_cfg1_optimization", False) == False:
uncond_ = None
else:
uncond_ = uncond
conds = [cond, uncond_]
out = calc_cond_batch(model, conds, x, timestep, model_options)
return cfg_function(model, out[0], out[1], cond_scale, x, timestep, model_options=model_options)
conds = [cond, uncond_]
out = calc_cond_batch(model, conds, x, timestep, model_options)
cond_pred = out[0]
uncond_pred = out[1]
if "sampler_cfg_function" in model_options:
args = {"cond": x - cond_pred, "uncond": x - uncond_pred, "cond_scale": cond_scale, "timestep": timestep, "input": x, "sigma": timestep,
"cond_denoised": cond_pred, "uncond_denoised": uncond_pred, "model": model, "model_options": model_options}
cfg_result = x - model_options["sampler_cfg_function"](args)
else:
cfg_result = uncond_pred + (cond_pred - uncond_pred) * cond_scale
for fn in model_options.get("sampler_post_cfg_function", []):
args = {"denoised": cfg_result, "cond": cond, "uncond": uncond, "model": model, "uncond_denoised": uncond_pred, "cond_denoised": cond_pred,
"sigma": timestep, "model_options": model_options, "input": x}
cfg_result = fn(args)
return cfg_result
class CFGNoisePredictor(torch.nn.Module):
def __init__(self, model, cond_scale=1.0):
super().__init__()
self.inner_model = model
self.cond_scale = cond_scale
def apply_model(self, x, timestep, conds, model_options={}, seed=None):
out = sampling_function(self.inner_model, x, timestep, conds.get("negative", None), conds.get("positive", None), self.cond_scale, model_options=model_options, seed=seed)
return out
def forward(self, *args, **kwargs):
return self.apply_model(*args, **kwargs)
class KSamplerX0Inpaint(torch.nn.Module):
class KSamplerX0Inpaint:
def __init__(self, model, sigmas):
super().__init__()
self.inner_model = model
self.sigmas = sigmas
def forward(self, x, sigma, conds, denoise_mask, model_options={}, seed=None):
def __call__(self, x, sigma, denoise_mask, model_options={}, seed=None):
if denoise_mask is not None:
if "denoise_mask_function" in model_options:
denoise_mask = model_options["denoise_mask_function"](sigma, denoise_mask, extra_options={"model": self.inner_model, "sigmas": self.sigmas})
latent_mask = 1. - denoise_mask
x = x * denoise_mask + self.inner_model.inner_model.model_sampling.noise_scaling(sigma.reshape([sigma.shape[0]] + [1] * (len(self.noise.shape) - 1)), self.noise, self.latent_image) * latent_mask
out = self.inner_model(x, sigma, conds=conds, model_options=model_options, seed=seed)
out = self.inner_model(x, sigma, model_options=model_options, seed=seed)
if denoise_mask is not None:
out = out * denoise_mask + self.latent_image * latent_mask
return out
@@ -601,22 +589,66 @@ def process_conds(model, noise, conds, device, latent_image=None, denoise_mask=N
return conds
class CFGGuider:
def __init__(self, model_patcher):
self.model_patcher = model_patcher
self.model_options = model_patcher.model_options
self.original_conds = {}
self.cfg = 1.0
def sample_advanced(model, noise, conds, guider_class, device, sampler, sigmas, model_options={}, latent_image=None, denoise_mask=None, callback=None, disable_pbar=False, seed=None):
if latent_image is not None and torch.count_nonzero(latent_image) > 0: #Don't shift the empty latent image.
latent_image = model.process_latent_in(latent_image)
def set_conds(self, conds):
for k in conds:
self.original_conds[k] = comfy.sampler_helpers.convert_cond(conds[k])
conds = process_conds(model, noise, conds, device, latent_image, denoise_mask, seed)
model_wrap = guider_class(model)
def set_cfg(self, cfg):
self.cfg = cfg
extra_args = {"conds": conds, "model_options": model_options, "seed":seed}
def __call__(self, *args, **kwargs):
return self.predict_noise(*args, **kwargs)
samples = sampler.sample(model_wrap, sigmas, extra_args, callback, noise, latent_image, denoise_mask, disable_pbar)
return model.process_latent_out(samples.to(torch.float32))
def predict_noise(self, x, timestep, model_options={}, seed=None):
return sampling_function(self.inner_model, x, timestep, self.conds.get("negative", None), self.conds.get("positive", None), self.cfg, model_options=model_options, seed=seed)
def inner_sample(self, noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed):
if latent_image is not None and torch.count_nonzero(latent_image) > 0: #Don't shift the empty latent image.
latent_image = self.inner_model.process_latent_in(latent_image)
self.conds = process_conds(self.inner_model, noise, self.conds, device, latent_image, denoise_mask, seed)
extra_args = {"model_options": self.model_options, "seed":seed}
samples = sampler.sample(self, sigmas, extra_args, callback, noise, latent_image, denoise_mask, disable_pbar)
return self.inner_model.process_latent_out(samples.to(torch.float32))
def sample(self, noise, latent_image, sampler, sigmas, denoise_mask=None, callback=None, disable_pbar=False, seed=None):
self.conds = {}
for k in self.original_conds:
self.conds[k] = list(map(lambda a: a.copy(), self.original_conds[k]))
self.inner_model, self.conds, self.loaded_models = comfy.sampler_helpers.prepare_sampling(self.model_patcher, noise.shape, self.conds)
device = self.model_patcher.load_device
if denoise_mask is not None:
denoise_mask = comfy.sampler_helpers.prepare_mask(denoise_mask, noise.shape, device)
noise = noise.to(device)
latent_image = latent_image.to(device)
sigmas = sigmas.to(device)
output = self.inner_sample(noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed)
comfy.sampler_helpers.cleanup_models(self.conds, self.loaded_models)
del self.inner_model
del self.conds
del self.loaded_models
return output
def sample(model, noise, positive, negative, cfg, device, sampler, sigmas, model_options={}, latent_image=None, denoise_mask=None, callback=None, disable_pbar=False, seed=None):
return sample_advanced(model, noise, {"positive": positive, "negative": negative}, lambda a: CFGNoisePredictor(a, cfg), device, sampler, sigmas, model_options, latent_image, denoise_mask, callback, disable_pbar, seed)
cfg_guider = CFGGuider(model)
cfg_guider.set_conds({"positive": positive, "negative": negative})
cfg_guider.set_cfg(cfg)
return cfg_guider.sample(noise, latent_image, sampler, sigmas, denoise_mask, callback, disable_pbar, seed)
SCHEDULER_NAMES = ["normal", "karras", "exponential", "sgm_uniform", "simple", "ddim_uniform"]
@@ -676,7 +708,7 @@ class KSampler:
steps += 1
discard_penultimate_sigma = True
sigmas = calculate_sigmas_scheduler(self.model, self.scheduler, steps)
sigmas = calculate_sigmas_scheduler(self.model.model, self.scheduler, steps)
if discard_penultimate_sigma:
sigmas = torch.cat([sigmas[:-2], sigmas[-1:]])