import torch import torch.nn as nn import torch.nn.functional as F class Transformer(nn.Module): def __init__(self): super(Transformer, self).__init__() # self.refpad01_1 = nn.ReflectionPad2d(3) self.conv01_1 = nn.Conv2d(3, 64, 7) self.in01_1 = InstanceNormalization(64) # relu self.conv02_1 = nn.Conv2d(64, 128, 3, 2, 1) self.conv02_2 = nn.Conv2d(128, 128, 3, 1, 1) self.in02_1 = InstanceNormalization(128) # relu self.conv03_1 = nn.Conv2d(128, 256, 3, 2, 1) self.conv03_2 = nn.Conv2d(256, 256, 3, 1, 1) self.in03_1 = InstanceNormalization(256) # relu ## res block 1 self.refpad04_1 = nn.ReflectionPad2d(1) self.conv04_1 = nn.Conv2d(256, 256, 3) self.in04_1 = InstanceNormalization(256) # relu self.refpad04_2 = nn.ReflectionPad2d(1) self.conv04_2 = nn.Conv2d(256, 256, 3) self.in04_2 = InstanceNormalization(256) # + input ## res block 2 self.refpad05_1 = nn.ReflectionPad2d(1) self.conv05_1 = nn.Conv2d(256, 256, 3) self.in05_1 = InstanceNormalization(256) # relu self.refpad05_2 = nn.ReflectionPad2d(1) self.conv05_2 = nn.Conv2d(256, 256, 3) self.in05_2 = InstanceNormalization(256) # + input ## res block 3 self.refpad06_1 = nn.ReflectionPad2d(1) self.conv06_1 = nn.Conv2d(256, 256, 3) self.in06_1 = InstanceNormalization(256) # relu self.refpad06_2 = nn.ReflectionPad2d(1) self.conv06_2 = nn.Conv2d(256, 256, 3) self.in06_2 = InstanceNormalization(256) # + input ## res block 4 self.refpad07_1 = nn.ReflectionPad2d(1) self.conv07_1 = nn.Conv2d(256, 256, 3) self.in07_1 = InstanceNormalization(256) # relu self.refpad07_2 = nn.ReflectionPad2d(1) self.conv07_2 = nn.Conv2d(256, 256, 3) self.in07_2 = InstanceNormalization(256) # + input ## res block 5 self.refpad08_1 = nn.ReflectionPad2d(1) self.conv08_1 = nn.Conv2d(256, 256, 3) self.in08_1 = InstanceNormalization(256) # relu self.refpad08_2 = nn.ReflectionPad2d(1) self.conv08_2 = nn.Conv2d(256, 256, 3) self.in08_2 = InstanceNormalization(256) # + input ## res block 6 self.refpad09_1 = nn.ReflectionPad2d(1) self.conv09_1 = nn.Conv2d(256, 256, 3) self.in09_1 = InstanceNormalization(256) # relu self.refpad09_2 = nn.ReflectionPad2d(1) self.conv09_2 = nn.Conv2d(256, 256, 3) self.in09_2 = InstanceNormalization(256) # + input ## res block 7 self.refpad10_1 = nn.ReflectionPad2d(1) self.conv10_1 = nn.Conv2d(256, 256, 3) self.in10_1 = InstanceNormalization(256) # relu self.refpad10_2 = nn.ReflectionPad2d(1) self.conv10_2 = nn.Conv2d(256, 256, 3) self.in10_2 = InstanceNormalization(256) # + input ## res block 8 self.refpad11_1 = nn.ReflectionPad2d(1) self.conv11_1 = nn.Conv2d(256, 256, 3) self.in11_1 = InstanceNormalization(256) # relu self.refpad11_2 = nn.ReflectionPad2d(1) self.conv11_2 = nn.Conv2d(256, 256, 3) self.in11_2 = InstanceNormalization(256) # + input ##------------------------------------## self.deconv01_1 = nn.ConvTranspose2d(256, 128, 3, 2, 1, 1) self.deconv01_2 = nn.Conv2d(128, 128, 3, 1, 1) self.in12_1 = InstanceNormalization(128) # relu self.deconv02_1 = nn.ConvTranspose2d(128, 64, 3, 2, 1, 1) self.deconv02_2 = nn.Conv2d(64, 64, 3, 1, 1) self.in13_1 = InstanceNormalization(64) # relu self.refpad12_1 = nn.ReflectionPad2d(3) self.deconv03_1 = nn.Conv2d(64, 3, 7) # tanh def forward(self, x): y = F.relu(self.in01_1(self.conv01_1(self.refpad01_1(x)))) y = F.relu(self.in02_1(self.conv02_2(self.conv02_1(y)))) t04 = F.relu(self.in03_1(self.conv03_2(self.conv03_1(y)))) ## y = F.relu(self.in04_1(self.conv04_1(self.refpad04_1(t04)))) t05 = self.in04_2(self.conv04_2(self.refpad04_2(y))) + t04 y = F.relu(self.in05_1(self.conv05_1(self.refpad05_1(t05)))) t06 = self.in05_2(self.conv05_2(self.refpad05_2(y))) + t05 y = F.relu(self.in06_1(self.conv06_1(self.refpad06_1(t06)))) t07 = self.in06_2(self.conv06_2(self.refpad06_2(y))) + t06 y = F.relu(self.in07_1(self.conv07_1(self.refpad07_1(t07)))) t08 = self.in07_2(self.conv07_2(self.refpad07_2(y))) + t07 y = F.relu(self.in08_1(self.conv08_1(self.refpad08_1(t08)))) t09 = self.in08_2(self.conv08_2(self.refpad08_2(y))) + t08 y = F.relu(self.in09_1(self.conv09_1(self.refpad09_1(t09)))) t10 = self.in09_2(self.conv09_2(self.refpad09_2(y))) + t09 y = F.relu(self.in10_1(self.conv10_1(self.refpad10_1(t10)))) t11 = self.in10_2(self.conv10_2(self.refpad10_2(y))) + t10 y = F.relu(self.in11_1(self.conv11_1(self.refpad11_1(t11)))) y = self.in11_2(self.conv11_2(self.refpad11_2(y))) + t11 ## y = F.relu(self.in12_1(self.deconv01_2(self.deconv01_1(y)))) y = F.relu(self.in13_1(self.deconv02_2(self.deconv02_1(y)))) y = F.tanh(self.deconv03_1(self.refpad12_1(y))) return y class InstanceNormalization(nn.Module): def __init__(self, dim, eps=1e-9): super(InstanceNormalization, self).__init__() self.scale = nn.Parameter(torch.FloatTensor(dim)) self.shift = nn.Parameter(torch.FloatTensor(dim)) self.eps = eps self._reset_parameters() def _reset_parameters(self): self.scale.data.uniform_() self.shift.data.zero_() def __call__(self, x): n = x.size(2) * x.size(3) t = x.view(x.size(0), x.size(1), n) mean = torch.mean(t, 2).unsqueeze(2).unsqueeze(3).expand_as(x) # Calculate the biased var. torch.var returns unbiased var var = torch.var(t, 2).unsqueeze(2).unsqueeze(3).expand_as(x) * ( (n - 1) / float(n) ) scale_broadcast = self.scale.unsqueeze(1).unsqueeze(1).unsqueeze(0) scale_broadcast = scale_broadcast.expand_as(x) shift_broadcast = self.shift.unsqueeze(1).unsqueeze(1).unsqueeze(0) shift_broadcast = shift_broadcast.expand_as(x) out = (x - mean) / torch.sqrt(var + self.eps) out = out * scale_broadcast + shift_broadcast return out