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networks.py
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import torch
import torch.nn as nn
from torch.nn.parameter import Parameter
class ResnetGenerator(nn.Module):
def __init__(self, input_nc, output_nc, ngf=64, n_blocks=6, img_size=512):
assert(n_blocks >= 0)
super(ResnetGenerator, self).__init__()
self.input_nc = input_nc
self.output_nc = output_nc
self.ngf = ngf
self.n_blocks = n_blocks
self.img_size = img_size
# Initial convolution block
DownBlock = []
DownBlock += [nn.ReflectionPad2d(3),
nn.Conv2d(input_nc, ngf, kernel_size=7, stride=1, padding=0, bias=False),
nn.InstanceNorm2d(ngf),
nn.ReLU(True)]
# Down-Sampling
n_downsampling = 2
for i in range(n_downsampling):
mult = 2**i
DownBlock += [nn.ReflectionPad2d(1),
nn.Conv2d(ngf * mult, ngf * mult * 2, kernel_size=3, stride=2, padding=0, bias=False),
nn.InstanceNorm2d(ngf * mult * 2),
nn.ReLU(True)]
# Down-Sampling Bottleneck, Residual blocks
mult = 2**n_downsampling
for i in range(n_blocks):
DownBlock += [ResnetBlock(ngf * mult, use_bias=False)]
self.gap_fc = nn.Linear(ngf * mult, 1, bias=False)
self.gmp_fc = nn.Linear(ngf * mult, 1, bias=False)
self.conv1x1 = nn.Conv2d(ngf * mult * 2, ngf * mult, kernel_size=1, stride=1, bias=True)
self.relu = nn.ReLU(True)
FC = [nn.Linear(ngf * mult, ngf * mult, bias=False),
nn.ReLU(True),
nn.Linear(ngf * mult, ngf * mult, bias=False),
nn.ReLU(True)]
self.gamma = nn.Linear(ngf * mult, ngf * mult, bias=False)
self.beta = nn.Linear(ngf * mult, ngf * mult, bias=False)
# Up-Sampling Bottleneck
for i in range(n_blocks):
setattr(self, 'UpBlock1_' + str(i+1), ResnetAdaILNBlock(ngf * mult, use_bias=False))
# Up-Sampling
UpBlock2 = []
for i in range(n_downsampling):
mult = 2**(n_downsampling - i)
UpBlock2 += [nn.Upsample(scale_factor=2, mode='nearest'),
nn.ReflectionPad2d(1),
nn.Conv2d(ngf * mult, int(ngf * mult / 2), kernel_size=3, stride=1, padding=0, bias=False),
ILN(int(ngf * mult / 2)),
nn.ReLU(True)]
# Output layer
UpBlock2 += [nn.ReflectionPad2d(3),
nn.Conv2d(ngf, output_nc, kernel_size=7, stride=1, padding=0, bias=False)]
self.DownBlock = nn.Sequential(*DownBlock)
self.FC = nn.Sequential(*FC)
self.UpBlock2 = nn.Sequential(*UpBlock2)
def forward(self, input):
x = self.DownBlock(input)
gap = torch.nn.functional.adaptive_avg_pool2d(x, 1)
gap_logit = self.gap_fc(gap.view(x.shape[0], -1))
gap_weight = list(self.gap_fc.parameters())[0]
gap = x * gap_weight.unsqueeze(2).unsqueeze(3)
gmp = torch.nn.functional.adaptive_max_pool2d(x, 1)
gmp_logit = self.gmp_fc(gmp.view(x.shape[0], -1))
gmp_weight = list(self.gmp_fc.parameters())[0]
gmp = x * gmp_weight.unsqueeze(2).unsqueeze(3)
c_logit = torch.cat([gap_logit, gmp_logit], 1)
x = torch.cat([gap, gmp], 1)
x = self.relu(self.conv1x1(x))
heatmap = torch.sum(x, dim=1, keepdim=True)
x_ = torch.nn.functional.adaptive_avg_pool2d(x, 1)
x_ = self.FC(x_.view(x_.shape[0], -1))
gamma, beta = self.gamma(x_), self.beta(x_)
for i in range(self.n_blocks):
x = getattr(self, 'UpBlock1_' + str(i+1))(x, gamma, beta)
out = (self.UpBlock2(x)+input).tanh()
return out, c_logit, heatmap
class ResnetBlock(nn.Module):
def __init__(self, dim, use_bias):
super(ResnetBlock, self).__init__()
conv_block = []
conv_block += [nn.ReflectionPad2d(1),
nn.Conv2d(dim, dim, kernel_size=3, stride=1, padding=0, bias=use_bias),
nn.InstanceNorm2d(dim),
nn.ReLU(True)]
conv_block += [nn.ReflectionPad2d(1),
nn.Conv2d(dim, dim, kernel_size=3, stride=1, padding=0, bias=use_bias),
nn.InstanceNorm2d(dim)]
self.conv_block = nn.Sequential(*conv_block)
def forward(self, x):
out = x + self.conv_block(x)
return out
class ResnetAdaILNBlock(nn.Module):
def __init__(self, dim, use_bias):
super(ResnetAdaILNBlock, self).__init__()
self.pad1 = nn.ReflectionPad2d(1)
self.conv1 = nn.Conv2d(dim, dim, kernel_size=3, stride=1, padding=0, bias=use_bias)
self.norm1 = adaILN(dim)
self.relu1 = nn.ReLU(True)
self.pad2 = nn.ReflectionPad2d(1)
self.conv2 = nn.Conv2d(dim, dim, kernel_size=3, stride=1, padding=0, bias=use_bias)
self.norm2 = adaILN(dim)
def forward(self, x, gamma, beta):
out = self.pad1(x)
out = self.conv1(out)
out = self.norm1(out, gamma, beta)
out = self.relu1(out)
out = self.pad2(out)
out = self.conv2(out)
out = self.norm2(out, gamma, beta)
return out + x
class Discriminator(nn.Module):
def __init__(self, input_nc, ndf=64, n_layers=5):
super(Discriminator, self).__init__()
model = [nn.ReflectionPad2d(1),
nn.utils.spectral_norm(
nn.Conv2d(input_nc, ndf, kernel_size=4, stride=2, padding=0, bias=True)),
nn.LeakyReLU(0.2, True)]
for i in range(1, n_layers - 2):
mult = 2 ** (i - 1)
model += [nn.ReflectionPad2d(1),
nn.utils.spectral_norm(
nn.Conv2d(ndf * mult, ndf * mult * 2, kernel_size=4, stride=2, padding=0, bias=True)),
nn.LeakyReLU(0.2, True)]
mult = 2 ** (n_layers - 2 - 1) #4
model += [nn.ReflectionPad2d(1),
nn.utils.spectral_norm(
nn.Conv2d(ndf * mult, ndf * mult * 2, kernel_size=4, stride=1, padding=0, bias=True)),
nn.LeakyReLU(0.2, True)] #(256, 512)
mult = 2 ** (n_layers - 2)
self.gap_fc = nn.utils.spectral_norm(nn.Linear(ndf * mult, 1, bias=False))
self.gmp_fc = nn.utils.spectral_norm(nn.Linear(ndf * mult, 1, bias=False))
self.conv1x1 = nn.Conv2d(ndf * mult * 2, ndf * mult, kernel_size=1, stride=1, bias=True)
self.leaky_relu = nn.LeakyReLU(0.2, True)
self.pad = nn.ReflectionPad2d(1)
# FCN classification layer
self.conv = nn.utils.spectral_norm(
nn.Conv2d(ndf * mult, 1, kernel_size=4, stride=1, padding=0, bias=False))#256
self.model = nn.Sequential(*model)
def forward(self, input):
x = self.model(input)
gap = torch.nn.functional.adaptive_avg_pool2d(x, 1)
gap_logit = self.gap_fc(gap.view(x.shape[0], -1))
gap_weight = list(self.gap_fc.parameters())[0]
gap = x * gap_weight.unsqueeze(2).unsqueeze(3)
gmp = torch.nn.functional.adaptive_max_pool2d(x, 1)
gmp_logit = self.gmp_fc(gmp.view(x.shape[0], -1))
gmp_weight = list(self.gmp_fc.parameters())[0]
gmp = x * gmp_weight.unsqueeze(2).unsqueeze(3)
c_logit = torch.cat([gap_logit, gmp_logit], 1)
x = torch.cat([gap, gmp], 1)
x = self.leaky_relu(self.conv1x1(x))
heatmap = torch.sum(x, dim=1, keepdim=True)
x = self.pad(x)
out = self.conv(x)
return out, c_logit, heatmap
class adaILN(nn.Module):
def __init__(self, num_features, eps=1e-5):
super(adaILN, self).__init__()
self.eps = eps
self.rho = Parameter(torch.Tensor(1, num_features, 1, 1))
self.rho.data.fill_(0.9)
def forward(self, input, gamma, beta):
in_mean, in_var = torch.mean(input, dim=[2, 3], keepdim=True), torch.var(input, dim=[2, 3], keepdim=True)
out_in = (input - in_mean) / torch.sqrt(in_var + self.eps)
ln_mean, ln_var = torch.mean(input, dim=[1, 2, 3], keepdim=True), torch.var(input, dim=[1, 2, 3], keepdim=True)
out_ln = (input - ln_mean) / torch.sqrt(ln_var + self.eps)
out = self.rho.expand(input.shape[0], -1, -1, -1) * out_in + (1-self.rho.expand(input.shape[0], -1, -1, -1)) * out_ln
out = out * gamma.unsqueeze(2).unsqueeze(3) + beta.unsqueeze(2).unsqueeze(3)
return out
class ILN(nn.Module):
def __init__(self, num_features, eps=1e-5):
super(ILN, self).__init__()
self.eps = eps
self.rho = Parameter(torch.Tensor(1, num_features, 1, 1))
self.gamma = Parameter(torch.Tensor(1, num_features, 1, 1))
self.beta = Parameter(torch.Tensor(1, num_features, 1, 1))
self.rho.data.fill_(0.0)
self.gamma.data.fill_(1.0)
self.beta.data.fill_(0.0)
def forward(self, input):
in_mean, in_var = torch.mean(input, dim=[2, 3], keepdim=True), torch.var(input, dim=[2, 3], keepdim=True)
out_in = (input - in_mean) / torch.sqrt(in_var + self.eps)
ln_mean, ln_var = torch.mean(input, dim=[1, 2, 3], keepdim=True), torch.var(input, dim=[1, 2, 3], keepdim=True)
out_ln = (input - ln_mean) / torch.sqrt(ln_var + self.eps)
out = self.rho.expand(input.shape[0], -1, -1, -1) * out_in + (1-self.rho.expand(input.shape[0], -1, -1, -1)) * out_ln
out = out * self.gamma.expand(input.shape[0], -1, -1, -1) + self.beta.expand(input.shape[0], -1, -1, -1)
return out