172 lines
6.6 KiB
Python
172 lines
6.6 KiB
Python
from collections import namedtuple
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import ldm.models.diffusion.ddim
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import torch
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import tqdm
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import k_diffusion.sampling
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import ldm.models.diffusion.ddim
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import ldm.models.diffusion.plms
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from modules.shared import opts, cmd_opts, state
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import modules.shared as shared
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SamplerData = namedtuple('SamplerData', ['name', 'constructor', 'aliases'])
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samplers_k_diffusion = [
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('Euler a', 'sample_euler_ancestral', ['k_euler_a']),
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('Euler', 'sample_euler', ['k_euler']),
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('LMS', 'sample_lms', ['k_lms']),
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('Heun', 'sample_heun', ['k_heun']),
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('DPM2', 'sample_dpm_2', ['k_dpm_2']),
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('DPM2 a', 'sample_dpm_2_ancestral', ['k_dpm_2_a']),
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]
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samplers_data_k_diffusion = [
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SamplerData(label, lambda model, funcname=funcname: KDiffusionSampler(funcname, model), aliases)
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for label, funcname, aliases in samplers_k_diffusion
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if hasattr(k_diffusion.sampling, funcname)
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]
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samplers = [
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*samplers_data_k_diffusion,
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SamplerData('DDIM', lambda model: VanillaStableDiffusionSampler(ldm.models.diffusion.ddim.DDIMSampler, model), []),
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SamplerData('PLMS', lambda model: VanillaStableDiffusionSampler(ldm.models.diffusion.plms.PLMSSampler, model), []),
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]
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samplers_for_img2img = [x for x in samplers if x.name != 'PLMS']
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def p_sample_ddim_hook(sampler_wrapper, x_dec, cond, ts, *args, **kwargs):
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if sampler_wrapper.mask is not None:
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img_orig = sampler_wrapper.sampler.model.q_sample(sampler_wrapper.init_latent, ts)
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x_dec = img_orig * sampler_wrapper.mask + sampler_wrapper.nmask * x_dec
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return sampler_wrapper.orig_p_sample_ddim(x_dec, cond, ts, *args, **kwargs)
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def extended_tdqm(sequence, *args, desc=None, **kwargs):
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state.sampling_steps = len(sequence)
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state.sampling_step = 0
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for x in tqdm.tqdm(sequence, *args, desc=state.job, **kwargs):
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if state.interrupted:
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break
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yield x
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state.sampling_step += 1
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ldm.models.diffusion.ddim.tqdm = lambda *args, desc=None, **kwargs: extended_tdqm(*args, desc=desc, **kwargs)
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ldm.models.diffusion.plms.tqdm = lambda *args, desc=None, **kwargs: extended_tdqm(*args, desc=desc, **kwargs)
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class VanillaStableDiffusionSampler:
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def __init__(self, constructor, sd_model):
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self.sampler = constructor(sd_model)
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self.orig_p_sample_ddim = self.sampler.p_sample_ddim if hasattr(self.sampler, 'p_sample_ddim') else None
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self.mask = None
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self.nmask = None
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self.init_latent = None
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def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning):
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t_enc = int(min(p.denoising_strength, 0.999) * p.steps)
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# existing code fails with cetin step counts, like 9
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try:
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self.sampler.make_schedule(ddim_num_steps=p.steps, verbose=False)
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except Exception:
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self.sampler.make_schedule(ddim_num_steps=p.steps+1, verbose=False)
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x1 = self.sampler.stochastic_encode(x, torch.tensor([t_enc] * int(x.shape[0])).to(shared.device), noise=noise)
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self.sampler.p_sample_ddim = lambda x_dec, cond, ts, *args, **kwargs: p_sample_ddim_hook(self, x_dec, cond, ts, *args, **kwargs)
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self.mask = p.mask
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self.nmask = p.nmask
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self.init_latent = p.init_latent
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samples = self.sampler.decode(x1, conditioning, t_enc, unconditional_guidance_scale=p.cfg_scale, unconditional_conditioning=unconditional_conditioning)
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return samples
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def sample(self, p, x, conditioning, unconditional_conditioning):
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samples_ddim, _ = self.sampler.sample(S=p.steps, conditioning=conditioning, batch_size=int(x.shape[0]), shape=x[0].shape, verbose=False, unconditional_guidance_scale=p.cfg_scale, unconditional_conditioning=unconditional_conditioning, x_T=x)
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return samples_ddim
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class CFGDenoiser(torch.nn.Module):
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def __init__(self, model):
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super().__init__()
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self.inner_model = model
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self.mask = None
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self.nmask = None
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self.init_latent = None
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def forward(self, x, sigma, uncond, cond, cond_scale):
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if shared.batch_cond_uncond:
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x_in = torch.cat([x] * 2)
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sigma_in = torch.cat([sigma] * 2)
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cond_in = torch.cat([uncond, cond])
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uncond, cond = self.inner_model(x_in, sigma_in, cond=cond_in).chunk(2)
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denoised = uncond + (cond - uncond) * cond_scale
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else:
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uncond = self.inner_model(x, sigma, cond=uncond)
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cond = self.inner_model(x, sigma, cond=cond)
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denoised = uncond + (cond - uncond) * cond_scale
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if self.mask is not None:
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denoised = self.init_latent * self.mask + self.nmask * denoised
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return denoised
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def extended_trange(count, *args, **kwargs):
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state.sampling_steps = count
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state.sampling_step = 0
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for x in tqdm.trange(count, *args, desc=state.job, **kwargs):
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if state.interrupted:
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break
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yield x
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state.sampling_step += 1
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class KDiffusionSampler:
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def __init__(self, funcname, sd_model):
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self.model_wrap = k_diffusion.external.CompVisDenoiser(sd_model)
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self.funcname = funcname
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self.func = getattr(k_diffusion.sampling, self.funcname)
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self.model_wrap_cfg = CFGDenoiser(self.model_wrap)
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def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning):
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t_enc = int(min(p.denoising_strength, 0.999) * p.steps)
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sigmas = self.model_wrap.get_sigmas(p.steps)
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noise = noise * sigmas[p.steps - t_enc - 1]
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xi = x + noise
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sigma_sched = sigmas[p.steps - t_enc - 1:]
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self.model_wrap_cfg.mask = p.mask
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self.model_wrap_cfg.nmask = p.nmask
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self.model_wrap_cfg.init_latent = p.init_latent
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if hasattr(k_diffusion.sampling, 'trange'):
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k_diffusion.sampling.trange = lambda *args, **kwargs: extended_trange(*args, **kwargs)
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return self.func(self.model_wrap_cfg, xi, sigma_sched, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False)
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def sample(self, p, x, conditioning, unconditional_conditioning):
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sigmas = self.model_wrap.get_sigmas(p.steps)
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x = x * sigmas[0]
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if hasattr(k_diffusion.sampling, 'trange'):
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k_diffusion.sampling.trange = lambda *args, **kwargs: extended_trange(*args, **kwargs)
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samples_ddim = self.func(self.model_wrap_cfg, x, sigmas, extra_args={'cond': conditioning, 'uncond': unconditional_conditioning, 'cond_scale': p.cfg_scale}, disable=False)
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return samples_ddim
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