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Implement noise augmentation for SD 4X upscale model.

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comfyanonymous
2024-01-03 14:27:11 -05:00
parent ef4f6037cb
commit 8c6493578b
6 changed files with 33 additions and 14 deletions
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12
comfy/ldm/modules/diffusionmodules/upscaling.py
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@@ -41,8 +41,12 @@ class AbstractLowScaleModel(nn.Module):
self.register_buffer('sqrt_recip_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod)))
self.register_buffer('sqrt_recipm1_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod - 1)))
def q_sample(self, x_start, t, noise=None):
noise = default(noise, lambda: torch.randn_like(x_start))
def q_sample(self, x_start, t, noise=None, seed=None):
if noise is None:
if seed is None:
noise = torch.randn_like(x_start)
else:
noise = torch.randn(x_start.size(), dtype=x_start.dtype, layout=x_start.layout, generator=torch.manual_seed(seed)).to(x_start.device)
return (extract_into_tensor(self.sqrt_alphas_cumprod.to(x_start.device), t, x_start.shape) * x_start +
extract_into_tensor(self.sqrt_one_minus_alphas_cumprod.to(x_start.device), t, x_start.shape) * noise)
@@ -69,12 +73,12 @@ class ImageConcatWithNoiseAugmentation(AbstractLowScaleModel):
super().__init__(noise_schedule_config=noise_schedule_config)
self.max_noise_level = max_noise_level
def forward(self, x, noise_level=None):
def forward(self, x, noise_level=None, seed=None):
if noise_level is None:
noise_level = torch.randint(0, self.max_noise_level, (x.shape[0],), device=x.device).long()
else:
assert isinstance(noise_level, torch.Tensor)
z = self.q_sample(x, noise_level)
z = self.q_sample(x, noise_level, seed=seed)
return z, noise_level