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| import torch | |
| import torch.nn as nn | |
| from .warplayer import warp | |
| import torch.nn.functional as F | |
| device = torch.device("cuda" if torch.cuda.is_available() else "cpu") | |
| def conv(in_planes, out_planes, kernel_size=3, stride=1, padding=1, dilation=1): | |
| return nn.Sequential( | |
| nn.Conv2d( | |
| in_planes, | |
| out_planes, | |
| kernel_size=kernel_size, | |
| stride=stride, | |
| padding=padding, | |
| dilation=dilation, | |
| bias=True, | |
| ), | |
| nn.PReLU(out_planes), | |
| ) | |
| def deconv(in_planes, out_planes, kernel_size=4, stride=2, padding=1): | |
| return nn.Sequential( | |
| torch.nn.ConvTranspose2d( | |
| in_channels=in_planes, out_channels=out_planes, kernel_size=4, stride=2, padding=1, bias=True | |
| ), | |
| nn.PReLU(out_planes), | |
| ) | |
| class Conv2(nn.Module): | |
| def __init__(self, in_planes, out_planes, stride=2): | |
| super(Conv2, self).__init__() | |
| self.conv1 = conv(in_planes, out_planes, 3, stride, 1) | |
| self.conv2 = conv(out_planes, out_planes, 3, 1, 1) | |
| def forward(self, x): | |
| x = self.conv1(x) | |
| x = self.conv2(x) | |
| return x | |
| c = 16 | |
| class Contextnet(nn.Module): | |
| def __init__(self): | |
| super(Contextnet, self).__init__() | |
| self.conv1 = Conv2(3, c) | |
| self.conv2 = Conv2(c, 2 * c) | |
| self.conv3 = Conv2(2 * c, 4 * c) | |
| self.conv4 = Conv2(4 * c, 8 * c) | |
| def forward(self, x, flow): | |
| x = self.conv1(x) | |
| flow = ( | |
| F.interpolate(flow, scale_factor=0.5, mode="bilinear", align_corners=False, recompute_scale_factor=False) | |
| * 0.5 | |
| ) | |
| f1 = warp(x, flow) | |
| x = self.conv2(x) | |
| flow = ( | |
| F.interpolate(flow, scale_factor=0.5, mode="bilinear", align_corners=False, recompute_scale_factor=False) | |
| * 0.5 | |
| ) | |
| f2 = warp(x, flow) | |
| x = self.conv3(x) | |
| flow = ( | |
| F.interpolate(flow, scale_factor=0.5, mode="bilinear", align_corners=False, recompute_scale_factor=False) | |
| * 0.5 | |
| ) | |
| f3 = warp(x, flow) | |
| x = self.conv4(x) | |
| flow = ( | |
| F.interpolate(flow, scale_factor=0.5, mode="bilinear", align_corners=False, recompute_scale_factor=False) | |
| * 0.5 | |
| ) | |
| f4 = warp(x, flow) | |
| return [f1, f2, f3, f4] | |
| class Unet(nn.Module): | |
| def __init__(self): | |
| super(Unet, self).__init__() | |
| self.down0 = Conv2(17, 2 * c) | |
| self.down1 = Conv2(4 * c, 4 * c) | |
| self.down2 = Conv2(8 * c, 8 * c) | |
| self.down3 = Conv2(16 * c, 16 * c) | |
| self.up0 = deconv(32 * c, 8 * c) | |
| self.up1 = deconv(16 * c, 4 * c) | |
| self.up2 = deconv(8 * c, 2 * c) | |
| self.up3 = deconv(4 * c, c) | |
| self.conv = nn.Conv2d(c, 3, 3, 1, 1) | |
| def forward(self, img0, img1, warped_img0, warped_img1, mask, flow, c0, c1): | |
| s0 = self.down0(torch.cat((img0, img1, warped_img0, warped_img1, mask, flow), 1)) | |
| s1 = self.down1(torch.cat((s0, c0[0], c1[0]), 1)) | |
| s2 = self.down2(torch.cat((s1, c0[1], c1[1]), 1)) | |
| s3 = self.down3(torch.cat((s2, c0[2], c1[2]), 1)) | |
| x = self.up0(torch.cat((s3, c0[3], c1[3]), 1)) | |
| x = self.up1(torch.cat((x, s2), 1)) | |
| x = self.up2(torch.cat((x, s1), 1)) | |
| x = self.up3(torch.cat((x, s0), 1)) | |
| x = self.conv(x) | |
| return torch.sigmoid(x) | |