|
- import math
- import random
- import functools
- import operator
-
- import torch
- from torch import nn
- from torch.nn import functional as F
- from torch.autograd import Function
-
- from op import FusedLeakyReLU, fused_leaky_relu, upfirdn2d, conv2d_gradfix
-
-
- class PixelNorm(nn.Module):
- def __init__(self):
- super().__init__()
-
- def forward(self, input):
- return input * torch.rsqrt(torch.mean(input ** 2, dim=1, keepdim=True) + 1e-8)
-
-
- def make_kernel(k):
- k = torch.tensor(k, dtype=torch.float32)
-
- if k.ndim == 1:
- k = k[None, :] * k[:, None]
-
- k /= k.sum()
-
- return k
-
-
- class Upsample(nn.Module):
- def __init__(self, kernel, factor=2):
- super().__init__()
-
- self.factor = factor
- kernel = make_kernel(kernel) * (factor ** 2)
- self.register_buffer("kernel", kernel)
-
- p = kernel.shape[0] - factor
-
- pad0 = (p + 1) // 2 + factor - 1
- pad1 = p // 2
-
- self.pad = (pad0, pad1)
-
- def forward(self, input):
- out = upfirdn2d(input, self.kernel, up=self.factor, down=1, pad=self.pad)
-
- return out
-
-
- class Downsample(nn.Module):
- def __init__(self, kernel, factor=2):
- super().__init__()
-
- self.factor = factor
- kernel = make_kernel(kernel)
- self.register_buffer("kernel", kernel)
-
- p = kernel.shape[0] - factor
-
- pad0 = (p + 1) // 2
- pad1 = p // 2
-
- self.pad = (pad0, pad1)
-
- def forward(self, input):
- out = upfirdn2d(input, self.kernel, up=1, down=self.factor, pad=self.pad)
-
- return out
-
-
- class Blur(nn.Module):
- def __init__(self, kernel, pad, upsample_factor=1):
- super().__init__()
-
- kernel = make_kernel(kernel)
-
- if upsample_factor > 1:
- kernel = kernel * (upsample_factor ** 2)
-
- self.register_buffer("kernel", kernel)
-
- self.pad = pad
-
- def forward(self, input):
- out = upfirdn2d(input, self.kernel, pad=self.pad)
-
- return out
-
-
- class EqualConv2d(nn.Module):
- def __init__(
- self, in_channel, out_channel, kernel_size, stride=1, padding=0, bias=True
- ):
- super().__init__()
-
- self.weight = nn.Parameter(
- torch.randn(out_channel, in_channel, kernel_size, kernel_size)
- )
- self.scale = 1 / math.sqrt(in_channel * kernel_size ** 2)
-
- self.stride = stride
- self.padding = padding
-
- if bias:
- self.bias = nn.Parameter(torch.zeros(out_channel))
-
- else:
- self.bias = None
-
- def forward(self, input):
- out = conv2d_gradfix.conv2d(
- input,
- self.weight * self.scale,
- bias=self.bias,
- stride=self.stride,
- padding=self.padding,
- )
-
- return out
-
- def __repr__(self):
- return (
- f"{self.__class__.__name__}({self.weight.shape[1]}, {self.weight.shape[0]},"
- f" {self.weight.shape[2]}, stride={self.stride}, padding={self.padding})"
- )
-
-
- class EqualLinear(nn.Module):
- def __init__(
- self, in_dim, out_dim, bias=True, bias_init=0, lr_mul=1, activation=None
- ):
- super().__init__()
-
- self.weight = nn.Parameter(torch.randn(out_dim, in_dim).div_(lr_mul))
-
- if bias:
- self.bias = nn.Parameter(torch.zeros(out_dim).fill_(bias_init))
-
- else:
- self.bias = None
-
- self.activation = activation
-
- self.scale = (1 / math.sqrt(in_dim)) * lr_mul
- self.lr_mul = lr_mul
-
- def forward(self, input):
- if self.activation:
- out = F.linear(input, self.weight * self.scale)
- out = fused_leaky_relu(out, self.bias * self.lr_mul)
-
- else:
- out = F.linear(
- input, self.weight * self.scale, bias=self.bias * self.lr_mul
- )
-
- return out
-
- def __repr__(self):
- return (
- f"{self.__class__.__name__}({self.weight.shape[1]}, {self.weight.shape[0]})"
- )
-
-
- class ModulatedConv2d(nn.Module):
- def __init__(
- self,
- in_channel,
- out_channel,
- kernel_size,
- style_dim,
- demodulate=True,
- upsample=False,
- downsample=False,
- blur_kernel=[1, 3, 3, 1],
- fused=True,
- ):
- super().__init__()
-
- self.eps = 1e-8
- self.kernel_size = kernel_size
- self.in_channel = in_channel
- self.out_channel = out_channel
- self.upsample = upsample
- self.downsample = downsample
-
- if upsample:
- factor = 2
- p = (len(blur_kernel) - factor) - (kernel_size - 1)
- pad0 = (p + 1) // 2 + factor - 1
- pad1 = p // 2 + 1
-
- self.blur = Blur(blur_kernel, pad=(pad0, pad1), upsample_factor=factor)
-
- if downsample:
- factor = 2
- p = (len(blur_kernel) - factor) + (kernel_size - 1)
- pad0 = (p + 1) // 2
- pad1 = p // 2
-
- self.blur = Blur(blur_kernel, pad=(pad0, pad1))
-
- fan_in = in_channel * kernel_size ** 2
- self.scale = 1 / math.sqrt(fan_in)
- self.padding = kernel_size // 2
-
- self.weight = nn.Parameter(
- torch.randn(1, out_channel, in_channel, kernel_size, kernel_size)
- )
-
- self.modulation = EqualLinear(style_dim, in_channel, bias_init=1)
-
- self.demodulate = demodulate
- self.fused = fused
-
- def __repr__(self):
- return (
- f"{self.__class__.__name__}({self.in_channel}, {self.out_channel}, {self.kernel_size}, "
- f"upsample={self.upsample}, downsample={self.downsample})"
- )
-
- def forward(self, input, style):
- batch, in_channel, height, width = input.shape
-
- if not self.fused:
- weight = self.scale * self.weight.squeeze(0)
- style = self.modulation(style)
-
- if self.demodulate:
- w = weight.unsqueeze(0) * style.view(batch, 1, in_channel, 1, 1)
- dcoefs = (w.square().sum((2, 3, 4)) + 1e-8).rsqrt()
-
- input = input * style.reshape(batch, in_channel, 1, 1)
-
- if self.upsample:
- weight = weight.transpose(0, 1)
- out = conv2d_gradfix.conv_transpose2d(
- input, weight, padding=0, stride=2
- )
- out = self.blur(out)
-
- elif self.downsample:
- input = self.blur(input)
- out = conv2d_gradfix.conv2d(input, weight, padding=0, stride=2)
-
- else:
- out = conv2d_gradfix.conv2d(input, weight, padding=self.padding)
-
- if self.demodulate:
- out = out * dcoefs.view(batch, -1, 1, 1)
-
- return out
-
- style = self.modulation(style).view(batch, 1, in_channel, 1, 1)
- weight = self.scale * self.weight * style
-
- if self.demodulate:
- demod = torch.rsqrt(weight.pow(2).sum([2, 3, 4]) + 1e-8)
- weight = weight * demod.view(batch, self.out_channel, 1, 1, 1)
-
- weight = weight.view(
- batch * self.out_channel, in_channel, self.kernel_size, self.kernel_size
- )
-
- if self.upsample:
- input = input.view(1, batch * in_channel, height, width)
- weight = weight.view(
- batch, self.out_channel, in_channel, self.kernel_size, self.kernel_size
- )
- weight = weight.transpose(1, 2).reshape(
- batch * in_channel, self.out_channel, self.kernel_size, self.kernel_size
- )
- out = conv2d_gradfix.conv_transpose2d(
- input, weight, padding=0, stride=2, groups=batch
- )
- _, _, height, width = out.shape
- out = out.view(batch, self.out_channel, height, width)
- out = self.blur(out)
-
- elif self.downsample:
- input = self.blur(input)
- _, _, height, width = input.shape
- input = input.view(1, batch * in_channel, height, width)
- out = conv2d_gradfix.conv2d(
- input, weight, padding=0, stride=2, groups=batch
- )
- _, _, height, width = out.shape
- out = out.view(batch, self.out_channel, height, width)
-
- else:
- input = input.view(1, batch * in_channel, height, width)
- out = conv2d_gradfix.conv2d(
- input, weight, padding=self.padding, groups=batch
- )
- _, _, height, width = out.shape
- out = out.view(batch, self.out_channel, height, width)
-
- return out
-
-
- class NoiseInjection(nn.Module):
- def __init__(self):
- super().__init__()
-
- self.weight = nn.Parameter(torch.zeros(1))
-
- def forward(self, image, noise=None):
- if noise is None:
- batch, _, height, width = image.shape
- noise = image.new_empty(batch, 1, height, width).normal_()
-
- return image + self.weight * noise
-
-
- class ConstantInput(nn.Module):
- def __init__(self, channel, size=4):
- super().__init__()
-
- self.input = nn.Parameter(torch.randn(1, channel, size, size))
-
- def forward(self, input):
- batch = input.shape[0]
- out = self.input.repeat(batch, 1, 1, 1)
-
- return out
-
-
- class StyledConv(nn.Module):
- def __init__(
- self,
- in_channel,
- out_channel,
- kernel_size,
- style_dim,
- upsample=False,
- downsample=False,
- blur_kernel=[1, 3, 3, 1],
- demodulate=True,
- ):
- super().__init__()
-
- self.conv = ModulatedConv2d(
- in_channel,
- out_channel,
- kernel_size,
- style_dim,
- upsample=upsample,
- downsample=downsample,
- blur_kernel=blur_kernel,
- demodulate=demodulate,
- )
-
- self.noise = NoiseInjection()
- # self.bias = nn.Parameter(torch.zeros(1, out_channel, 1, 1))
- # self.activate = ScaledLeakyReLU(0.2)
- self.activate = FusedLeakyReLU(out_channel)
-
- def forward(self, input, style, noise=None):
- out = self.conv(input, style)
- out = self.noise(out, noise=noise)
- # out = out + self.bias
- out = self.activate(out)
-
- return out
-
-
- class ToRGB(nn.Module):
- def __init__(self, in_channel, style_dim, upsample=True, blur_kernel=[1, 3, 3, 1]):
- super().__init__()
-
- if upsample:
- self.upsample = Upsample(blur_kernel)
-
- self.conv = ModulatedConv2d(in_channel, 3, 1, style_dim, demodulate=False)
- self.bias = nn.Parameter(torch.zeros(1, 3, 1, 1))
-
- def forward(self, input, style, skip=None):
- out = self.conv(input, style)
- out = out + self.bias
-
- if skip is not None:
- skip = self.upsample(skip)
-
- out = out + skip
-
- return out
-
- class DoubleConv(nn.Module):
- def __init__(self, input_channel, out_channel,style_dim,blur_kernel=[1, 3, 3, 1],upsample=False,
- downsample=False,):
- super().__init__()
- self.double_conv = nn.Sequential(
- StyledConv(
- input_channel, out_channel, 3, style_dim, blur_kernel=blur_kernel),
- StyledConv(
- out_channel, out_channel, 3, style_dim, blur_kernel=blur_kernel),
- )
- # self.latent=latent
- # self.noise=noise
- def forward(self, x,latent,noise):
- i=0
- for conv1,conv2,noise1,noise2 in zip(
- self.double_conv[::2],self.double_conv[1::2],noise[::2],noise[1::2]
- ):
- out=conv1(x,latent[:,i],noise=noise1)
- out=conv2(out,latent[:,i+1],noise=noise2)
- i+=2
- return out
- # class DownConv(nn.Module):
- # def __init__(self):
- # super().__init__()
- # def forward(self, x,latent,noise):
-
- class Unet(nn.Module):
- def __init__(
- self,
- input_channel,
- out_channel,
- style_dim,
- blur_kernel=[1, 3, 3, 1],):
- super().__init__()
- self.conv1=DoubleConv(input_channel,64,style_dim,blur_kernel)
- self.conv2=StyledConv(
- 64, 64, 3, style_dim, downsample=True,blur_kernel=blur_kernel) #下采样
- self.conv3=DoubleConv(64,128,style_dim,blur_kernel)
- self.conv4=StyledConv(
- 128, 128, 3, style_dim, downsample=True,blur_kernel=blur_kernel) #下采样
- self.conv5=DoubleConv(128,256,style_dim,blur_kernel)
- self.conv6=StyledConv(
- 256,128 , 3, style_dim, upsample=True,blur_kernel=blur_kernel)#上采样
- self.conv7=DoubleConv(256,128,style_dim,blur_kernel)
- self.conv8=StyledConv(
- 128,64 , 3, style_dim, upsample=True,blur_kernel=blur_kernel)#上采样
- self.conv9=DoubleConv(128,64,style_dim,blur_kernel)
- self.conv10=StyledConv(
- 64,out_channel , 1, style_dim,blur_kernel=blur_kernel)
- def forward(
- self,
- x,
- latent,
- noise,
- ):
-
- out=self.conv1(x,latent[:,:2],noise=noise[:2])
- out1=self.conv2(out,latent[:,2],noise=noise[2])#下采样
- out2=self.conv3(out1,latent[:,3:5],noise=noise[3:5])
- out3=self.conv4(out2,latent[:,5],noise=noise[5])#下采样
- out4=self.conv5(out3,latent[:,6:8],noise=noise[6:8])
- out5=self.conv6(out4,latent[:,8],noise=noise[8])#上采样
- out5=torch.cat([out2,out5],dim=1)#特征融合
- out6=self.conv7(out5,latent[:,9:11],noise=noise[9:11])
- out7=self.conv8(out6,latent[:,11],noise=noise[11])#上采样
- out7=torch.cat([out,out7],dim=1)#特征融合
- out8=self.conv9(out7,latent[:,12:14],noise=noise[12:14])
- out=self.conv10(out8,latent[:,14],noise=noise[14])
-
-
- return out
-
- class Generator(nn.Module):
- def __init__(
- self,
- size,
- style_dim,
- n_mlp,
- channel_multiplier=2,
- blur_kernel=[1, 3, 3, 1],
- lr_mlp=0.01,
- ):
- super().__init__()
-
- self.size = size
-
- self.style_dim = style_dim
-
- layers = [PixelNorm()]
-
- for i in range(n_mlp):
- layers.append(
- EqualLinear(
- style_dim, style_dim, lr_mul=lr_mlp, activation="fused_lrelu"
- )
- )
-
- self.style = nn.Sequential(*layers)
-
- self.channels = {
- 4: 512,
- 8: 512,
- 16: 512,
- 32: 512,
- 64: 256 * channel_multiplier,
- 128: 128 * channel_multiplier,
- 256: 64 * channel_multiplier,
- 512: 32 * channel_multiplier,
- 1024: 16 * channel_multiplier,
- }
-
- self.input = ConstantInput(self.channels[4])
- self.conv1 = StyledConv(
- self.channels[4], self.channels[4], 3, style_dim, blur_kernel=blur_kernel
- )
- self.to_rgb1 = ToRGB(self.channels[4], style_dim, upsample=False)
-
- self.log_size = int(math.log(size, 2))
- self.unet_layers_nums=self.log_size-2
- self.num_layers = (self.log_size - 2) * 2 + 1
-
- self.convs = nn.ModuleList()
- self.upsamples = nn.ModuleList()
- self.to_rgbs = nn.ModuleList()
- self.noises = nn.Module()
- self.unet_layers=nn.ModuleList()
- in_channel = self.channels[4]
-
- for layer_idx in range(self.num_layers):
- res = (layer_idx + 5) // 2
- shape = [1, 1, 2 ** res, 2 ** res]
- self.noises.register_buffer(f"noise_{layer_idx}", torch.randn(*shape))
-
- for i in range(3, self.log_size + 1): #从8开始到128,一共加8,16,32,64,128.5个unet
- out_channel = self.channels[2 ** i]
-
- self.convs.append(
- StyledConv(
- in_channel,
- out_channel,
- 3,
- style_dim,
- upsample=True,
- blur_kernel=blur_kernel,
- )
- )
- self.unet_layers.append(
- Unet(out_channel,out_channel,style_dim,blur_kernel=blur_kernel)
- )#需要15个latent,15个noise
- self.convs.append(
- StyledConv(
- out_channel, out_channel, 3, style_dim, blur_kernel=blur_kernel
- )
- )
-
- self.to_rgbs.append(ToRGB(out_channel, style_dim))
-
- in_channel = out_channel
-
- self.n_latent = self.log_size * 2 - 2 +self.unet_layers_nums*15
-
- def make_noise(self):
- device = self.input.input.device
-
- noises = [torch.randn(1, 1, 2 ** 2, 2 ** 2, device=device)]
-
- for i in range(3, self.log_size + 1):
- for _ in range(2):
- noises.append(torch.randn(1, 1, 2 ** i, 2 ** i, device=device))
-
- return noises
-
- def mean_latent(self, n_latent):
- latent_in = torch.randn(
- n_latent, self.style_dim, device=self.input.input.device
- )
- latent = self.style(latent_in).mean(0, keepdim=True)
-
- return latent
-
- def get_latent(self, input):
- return self.style(input)
-
- def forward(
- self,
- styles,
- return_latents=False,
- inject_index=None,
- truncation=1,
- truncation_latent=None,
- input_is_latent=False,
- noise=None,
- randomize_noise=True,
- ):
- if not input_is_latent:
- styles = [self.style(s) for s in styles]
-
- if noise is None:
- if randomize_noise:
- noise = [None] * self.num_layers
- else:
- noise = [
- getattr(self.noises, f"noise_{i}") for i in range(self.num_layers)
- ]
- unet_noise=[None]* (self.unet_layers_nums*15)
- if truncation < 1:
- style_t = []
-
- for style in styles:
- style_t.append(
- truncation_latent + truncation * (style - truncation_latent)
- )
-
- styles = style_t
-
- if len(styles) < 2:
- inject_index = self.n_latent
-
- if styles[0].ndim < 3:
- latent = styles[0].unsqueeze(1).repeat(1, inject_index, 1)
-
- else:
- latent = styles[0]
-
- else:
- if inject_index is None:
- inject_index = random.randint(1, self.n_latent - 1)
-
- latent = styles[0].unsqueeze(1).repeat(1, inject_index, 1)
- latent2 = styles[1].unsqueeze(1).repeat(1, self.n_latent - inject_index, 1)
-
- latent = torch.cat([latent, latent2], 1)
-
- out = self.input(latent)
- out = self.conv1(out, latent[:, 0], noise=noise[0])
-
- skip = self.to_rgb1(out, latent[:, 1])
-
- i = 1
- j=0
- for conv1, conv2, noise1, noise2,to_rgb in zip(
- self.convs[::2], self.convs[1::2], noise[1::2], noise[2::2],self.to_rgbs
- ):
- out = conv1(out, latent[:, i], noise=noise1)
- out = self.unet_layers[j](out,latent=latent[:,i+1:i+1+15],noise=unet_noise[j*15:j*15+15])
- out = conv2(out, latent[:, i + 1+15], noise=noise2)
- skip = to_rgb(out, latent[:, i + 2+15], skip)
- j+=1
- i += 2+15
-
- image = skip
-
- if return_latents:
- return image, latent
-
- else:
- return image, None
-
-
- class ConvLayer(nn.Sequential):
- def __init__(
- self,
- in_channel,
- out_channel,
- kernel_size,
- downsample=False,
- blur_kernel=[1, 3, 3, 1],
- bias=True,
- activate=True,
- ):
- layers = []
-
- if downsample:
- factor = 2
- p = (len(blur_kernel) - factor) + (kernel_size - 1)
- pad0 = (p + 1) // 2
- pad1 = p // 2
-
- layers.append(Blur(blur_kernel, pad=(pad0, pad1)))
-
- stride = 2
- self.padding = 0
-
- else:
- stride = 1
- self.padding = kernel_size // 2
-
- layers.append(
- EqualConv2d(
- in_channel,
- out_channel,
- kernel_size,
- padding=self.padding,
- stride=stride,
- bias=bias and not activate,
- )
- )
-
- if activate:
- layers.append(FusedLeakyReLU(out_channel, bias=bias))
-
- super().__init__(*layers)
-
-
- class ResBlock(nn.Module):
- def __init__(self, in_channel, out_channel, blur_kernel=[1, 3, 3, 1]):
- super().__init__()
-
- self.conv1 = ConvLayer(in_channel, in_channel, 3)
- self.conv2 = ConvLayer(in_channel, out_channel, 3, downsample=True)
-
- self.skip = ConvLayer(
- in_channel, out_channel, 1, downsample=True, activate=False, bias=False
- )
-
- def forward(self, input):
- out = self.conv1(input)
- out = self.conv2(out)
-
- skip = self.skip(input)
- out = (out + skip) / math.sqrt(2)
-
- return out
-
-
- class Discriminator(nn.Module):
- def __init__(self, size, channel_multiplier=2, blur_kernel=[1, 3, 3, 1]):
- super().__init__()
-
- channels = {
- 4: 512,
- 8: 512,
- 16: 512,
- 32: 512,
- 64: 256 * channel_multiplier,
- 128: 128 * channel_multiplier,
- 256: 64 * channel_multiplier,
- 512: 32 * channel_multiplier,
- 1024: 16 * channel_multiplier,
- }
-
- convs = [ConvLayer(3, channels[size], 1)]
-
- log_size = int(math.log(size, 2))
-
- in_channel = channels[size]
-
- for i in range(log_size, 2, -1):
- out_channel = channels[2 ** (i - 1)]
-
- convs.append(ResBlock(in_channel, out_channel, blur_kernel))
-
- in_channel = out_channel
-
- self.convs = nn.Sequential(*convs)
-
- self.stddev_group = 4
- self.stddev_feat = 1
-
- self.final_conv = ConvLayer(in_channel + 1, channels[4], 3)
- self.final_linear = nn.Sequential(
- EqualLinear(channels[4] * 4 * 4, channels[4], activation="fused_lrelu"),
- EqualLinear(channels[4], 1),
- )
-
- def forward(self, input):
- out = self.convs(input)
-
- batch, channel, height, width = out.shape
- group = min(batch, self.stddev_group)
- stddev = out.view(
- group, -1, self.stddev_feat, channel // self.stddev_feat, height, width
- )
- stddev = torch.sqrt(stddev.var(0, unbiased=False) + 1e-8)
- stddev = stddev.mean([2, 3, 4], keepdims=True).squeeze(2)
- stddev = stddev.repeat(group, 1, height, width)
- out = torch.cat([out, stddev], 1)
-
- out = self.final_conv(out)
-
- out = out.view(batch, -1)
- out = self.final_linear(out)
-
- return out
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