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67 lines
2.9 KiB
67 lines
2.9 KiB
1 year ago
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import torch
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from comfy.ldm.modules.diffusionmodules.openaimodel import UNetModel
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from comfy.ldm.modules.encoders.noise_aug_modules import CLIPEmbeddingNoiseAugmentation
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from comfy.ldm.modules.diffusionmodules.util import make_beta_schedule
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import numpy as np
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class BaseModel(torch.nn.Module):
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def __init__(self, unet_config, v_prediction=False):
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super().__init__()
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self.register_schedule(given_betas=None, beta_schedule="linear", timesteps=1000, linear_start=0.00085, linear_end=0.012, cosine_s=8e-3)
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self.diffusion_model = UNetModel(**unet_config)
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self.v_prediction = v_prediction
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if self.v_prediction:
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self.parameterization = "v"
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else:
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self.parameterization = "eps"
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if "adm_in_channels" in unet_config:
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self.adm_channels = unet_config["adm_in_channels"]
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else:
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self.adm_channels = 0
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print("v_prediction", v_prediction)
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print("adm", self.adm_channels)
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def register_schedule(self, given_betas=None, beta_schedule="linear", timesteps=1000,
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linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
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if given_betas is not None:
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betas = given_betas
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else:
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betas = make_beta_schedule(beta_schedule, timesteps, linear_start=linear_start, linear_end=linear_end, cosine_s=cosine_s)
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alphas = 1. - betas
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alphas_cumprod = np.cumprod(alphas, axis=0)
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alphas_cumprod_prev = np.append(1., alphas_cumprod[:-1])
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timesteps, = betas.shape
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self.num_timesteps = int(timesteps)
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self.linear_start = linear_start
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self.linear_end = linear_end
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self.register_buffer('betas', torch.tensor(betas, dtype=torch.float32))
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self.register_buffer('alphas_cumprod', torch.tensor(alphas_cumprod, dtype=torch.float32))
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self.register_buffer('alphas_cumprod_prev', torch.tensor(alphas_cumprod_prev, dtype=torch.float32))
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def apply_model(self, x, t, c_concat=None, c_crossattn=None, c_adm=None, control=None, transformer_options={}):
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if c_concat is not None:
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xc = torch.cat([x] + c_concat, dim=1)
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else:
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xc = x
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context = torch.cat(c_crossattn, 1)
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return self.diffusion_model(xc, t, context=context, y=c_adm, control=control, transformer_options=transformer_options)
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def get_dtype(self):
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return self.diffusion_model.dtype
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def is_adm(self):
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return self.adm_channels > 0
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class SD21UNCLIP(BaseModel):
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def __init__(self, unet_config, noise_aug_config, v_prediction=True):
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super().__init__(unet_config, v_prediction)
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self.noise_augmentor = CLIPEmbeddingNoiseAugmentation(**noise_aug_config)
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class SDInpaint(BaseModel):
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def __init__(self, unet_config, v_prediction=False):
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super().__init__(unet_config, v_prediction)
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self.concat_keys = ("mask", "masked_image")
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