236 lines
8.0 KiB
Python
236 lines
8.0 KiB
Python
import torch
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import torch.nn as nn
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from torch.nn import functional as F
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from timm import create_model
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import einops
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from diffusers.models.normalization import AdaGroupNorm
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from timm.layers import use_fused_attn
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from comfy.utils import common_upscale
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class Attention(nn.Module):
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fused_attn = True
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def __init__(
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self,
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dim: int,
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num_heads: int = 8,
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qkv_bias: bool = False,
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qk_norm: bool = False,
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attn_drop: float = 0.0,
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proj_drop: float = 0.0,
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norm_layer: nn.Module = nn.LayerNorm,
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) -> None:
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super().__init__()
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assert dim % num_heads == 0, "dim should be divisible by num_heads"
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self.num_heads = num_heads
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self.head_dim = dim // num_heads
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self.scale = self.head_dim**-0.5
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self.fused_attn = use_fused_attn()
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self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
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self.q_norm = norm_layer(self.head_dim) if qk_norm else nn.Identity()
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self.k_norm = norm_layer(self.head_dim) if qk_norm else nn.Identity()
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self.attn_drop = nn.Dropout(attn_drop)
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self.proj = nn.Linear(dim, dim)
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self.proj_drop = nn.Dropout(proj_drop)
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def forward(self, x: torch.Tensor) -> torch.Tensor:
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B, N, C = x.shape
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qkv = self.qkv(x).reshape(B, N, 3, self.num_heads, self.head_dim).permute(2, 0, 3, 1, 4)
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q, k, v = qkv.unbind(0)
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q, k = self.q_norm(q), self.k_norm(k)
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if self.fused_attn:
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x = F.scaled_dot_product_attention(
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q,
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k,
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v,
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dropout_p=self.attn_drop.p if self.training else 0.0,
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)
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else:
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q = q * self.scale
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attn = q @ k.transpose(-2, -1)
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attn = attn.softmax(dim=-1)
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attn = self.attn_drop(attn)
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x = attn @ v
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x = x.transpose(1, 2).reshape(B, N, C)
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x = self.proj(x)
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x = self.proj_drop(x)
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return x
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class SVDNoiseUnet(nn.Module):
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def __init__(self, in_channels=4, out_channels=4, resolution=128): # resolution = size // 8
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super(SVDNoiseUnet, self).__init__()
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_in = int(resolution * in_channels // 2)
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_out = int(resolution * out_channels // 2)
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self.mlp1 = nn.Sequential(
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nn.Linear(_in, 64),
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nn.ReLU(inplace=True),
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nn.Linear(64, _out),
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)
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self.mlp2 = nn.Sequential(
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nn.Linear(_in, 64),
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nn.ReLU(inplace=True),
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nn.Linear(64, _out),
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)
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self.mlp3 = nn.Sequential(
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nn.Linear(_in, _out),
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)
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self.attention = Attention(_out)
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self.bn = nn.BatchNorm2d(_out)
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self.mlp4 = nn.Sequential(
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nn.Linear(_out, 1024),
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nn.ReLU(inplace=True),
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nn.Linear(1024, _out),
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)
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def forward(self, x, residual=False):
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b, c, h, w = x.shape
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x = einops.rearrange(x, "b (a c)h w ->b (a h)(c w)", a=2, c=2) # x -> [1, 256, 256]
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U, s, V = torch.linalg.svd(x) # U->[b 256 256], s-> [b 256], V->[b 256 256]
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U_T = U.permute(0, 2, 1)
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out = self.mlp1(U_T) + self.mlp2(V) + self.mlp3(s).unsqueeze(1) # s -> [b, 1, 256] => [b, 256, 256]
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out = self.attention(out).mean(1)
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out = self.mlp4(out) + s
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pred = U @ torch.diag_embed(out) @ V
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return einops.rearrange(pred, "b (a h)(c w) -> b (a c) h w", a=2, c=2)
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class SVDNoiseUnet_Concise(nn.Module):
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def __init__(self, in_channels=4, out_channels=4, resolution=128):
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super(SVDNoiseUnet_Concise, self).__init__()
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class NoiseTransformer(nn.Module):
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def __init__(self, resolution=128):
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super().__init__()
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self.upsample = lambda x: F.interpolate(x, [224, 224])
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self.downsample = lambda x: F.interpolate(x, [resolution, resolution])
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self.upconv = nn.Conv2d(7, 4, (1, 1), (1, 1), (0, 0))
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self.downconv = nn.Conv2d(4, 3, (1, 1), (1, 1), (0, 0))
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# self.upconv = nn.Conv2d(7,4,(1,1),(1,1),(0,0))
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self.swin = create_model("swin_tiny_patch4_window7_224", pretrained=True)
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def forward(self, x, residual=False):
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if residual:
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x = self.upconv(self.downsample(self.swin.forward_features(self.downconv(self.upsample(x))))) + x
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else:
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x = self.upconv(self.downsample(self.swin.forward_features(self.downconv(self.upsample(x)))))
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return x
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class NPNet(nn.Module):
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def __init__(self, model_id, pretrained_path, device="cuda") -> None:
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super().__init__()
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assert model_id in ["SDXL", "DreamShaper", "DiT"]
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self.model_id = model_id
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self.device = device
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self.pretrained_path = pretrained_path
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self.unet_embedding = NoiseTransformer(resolution=128)
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self.unet_svd = SVDNoiseUnet(resolution=128)
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if self.model_id == "DiT":
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self.text_embedding = AdaGroupNorm(1024 * 77, 4, 1, eps=1e-6)
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else:
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self.text_embedding = AdaGroupNorm(2048 * 77, 4, 1, eps=1e-6)
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sd = torch.load(self.pretrained_path, weights_only=True, map_location=self.device)
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self.unet_embedding.load_state_dict(sd['unet_embedding'])
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self.unet_svd.load_state_dict(sd['unet_svd'])
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self.text_embedding.load_state_dict(sd['embeeding'])
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self.alpha = sd['alpha']
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self.beta = sd['beta']
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self.to(torch.float32).to(self.device)
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def forward(self, initial_noise, prompt_embeds):
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prompt_embeds = prompt_embeds.float().view(prompt_embeds.shape[0], -1)
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text_emb = self.text_embedding(initial_noise.float(), prompt_embeds)
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encoder_hidden_states_svd = initial_noise
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encoder_hidden_states_embedding = initial_noise + text_emb
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golden_embedding = self.unet_embedding(encoder_hidden_states_embedding.float())
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golden_noise = (
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self.unet_svd(encoder_hidden_states_svd.float())
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+ (2 * torch.sigmoid(self.alpha) - 1) * text_emb
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+ self.beta * golden_embedding
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)
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return golden_noise
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class NPNetGoldenNoise:
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npnet = None
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noise = None
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cond = None
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seed = None
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@classmethod
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def INPUT_TYPES(s):
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return {
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"required": {
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"noise": ("NOISE",),
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"prompt": ("CONDITIONING",),
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"model_path": ("STRING", {"default": "/path/to/sdxl.pth"}),
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"model_type": (["SDXL", "DreamShaper", "DiT"],),
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"device": (["cuda", "cpu"],)
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}
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}
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RETURN_TYPES = ("NOISE",)
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CATEGORY = "_for_testing/golden_noise"
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FUNCTION = "doit"
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def generate_noise(self, input_latent):
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self.seed = self.noise.seed
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orig_shape = input_latent["samples"].shape
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if orig_shape[-2] != 128 or orig_shape[-1] != 128:
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input_latent = input_latent.copy()
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print("Latent must be 128x128 for the NPNet model to work; generating square noise and reshaping...")
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input_latent["samples"] = common_upscale(input_latent["samples"], 128, 128, "nearest-exact", "disabled")
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init_noise = self.noise.generate_noise(input_latent).to(self.npnet.device)
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cond = self.cond[0].clone().to(self.npnet.device)
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if cond.shape[1] != 77:
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print("NPNet can't handle conds >77 tokens, truncating...")
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cond = cond[:, :77, :]
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try:
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print("Applying NPNet to noise")
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r = self.npnet(init_noise, cond).to("cpu")
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if orig_shape[-2] != 128 or orig_shape[-1] != 128:
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r = common_upscale(r, orig_shape[-1], orig_shape[-2], "nearest-exact", "disabled")
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except Exception as e:
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print("Running NPNet failed with error, returning unmodified noise:", e)
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return init_noise
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print("NPNet ran ok")
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return r
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def doit(self, noise, prompt, model_path, model_type, device):
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if self.npnet is None:
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print("Loading NPNet")
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self.npnet = NPNet(model_type, model_path, device=device)
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self.npnet.to(device)
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self.noise = noise
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self.cond = prompt[0]
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return (self,)
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NODE_CLASS_MAPPINGS = {"NPNetGoldenNoise": NPNetGoldenNoise}
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