if I try to change the kernel size of cnn in the following code it gives me error maybe because the dimensions of skip connection does not match x, How can I amend the code for kernel size 4
import torch
import torch.nn as nn
import torchvision.transforms.functional as TF
class DoubleConv(nn.Module):
def init(self, in_channels, out_channels):
super(DoubleConv, self).init()
self.conv = nn.Sequential(
nn.Conv2d(in_channels, out_channels, 4, 1, 1, bias=False),
nn.BatchNorm2d(out_channels),
nn.ReLU(inplace=True),
nn.Conv2d(out_channels, out_channels, 4, 1, 1, bias=False),
nn.BatchNorm2d(out_channels),
nn.ReLU(inplace=True),
)
def forward(self, x):
return self.conv(x)
class UNET(nn.Module):
def init(
self, in_channels=3, out_channels=1, features=[64, 128, 256, 512],
):
super(UNET, self).init()
self.ups = nn.ModuleList()
self.downs = nn.ModuleList()
self.pool = nn.MaxPool2d(kernel_size=2, stride=2)
# Down part of UNET
for feature in features:
self.downs.append(DoubleConv(in_channels, feature))
in_channels = feature
# Up part of UNET
for feature in reversed(features):
self.ups.append(
nn.ConvTranspose2d(
feature*2, feature, kernel_size=2, stride=2,
)
)
self.ups.append(DoubleConv(feature*2, feature))
self.bottleneck = DoubleConv(features[-1], features[-1]*2)
self.final_conv = nn.Conv2d(features[0], out_channels, kernel_size=1)
def forward(self, x):
skip_connections = []
for down in self.downs:
x = down(x)
skip_connections.append(x)
x = self.pool(x)
x = self.bottleneck(x)
skip_connections = skip_connections[::-1]
for idx in range(0, len(self.ups), 2):
x = self.ups[idx](x)
skip_connection = skip_connections[idx//2]
if x.shape != skip_connection.shape:
x = TF.resize(x, size=skip_connection.shape[2:])
concat_skip = torch.cat((skip_connection, x), dim=1)
x = self.ups[idx+1](concat_skip)
return self.final_conv(x)
def test():
x = torch.randn((2, 1, 512, 512))
model = UNET(in_channels=1, out_channels=1)
preds = model(x)
print(preds.shape)
print(x.shape)
assert preds.shape == x.shape
if name == “main”:
test()