UNET跳跃连接MATLAB代码

以下是一个简单的UNet跳跃连接的MATLAB代码示例：

% 定义UNET网络结构
inputLayer = imageInputLayer([256 256 3]);
conv1 = convolution2dLayer(3, 64, 'Padding', 'same');
relu1 = reluLayer();
conv2 = convolution2dLayer(3, 64, 'Padding', 'same');
relu2 = reluLayer();
pool1 = maxPooling2dLayer(2, 'Stride', 2);
conv3 = convolution2dLayer(3, 128, 'Padding', 'same');
relu3 = reluLayer();
conv4 = convolution2dLayer(3, 128, 'Padding', 'same');
relu4 = reluLayer();
pool2 = maxPooling2dLayer(2, 'Stride', 2);
conv5 = convolution2dLayer(3, 256, 'Padding', 'same');
relu5 = reluLayer();
conv6 = convolution2dLayer(3, 256, 'Padding', 'same');
relu6 = reluLayer();
pool3 = maxPooling2dLayer(2, 'Stride', 2);
conv7 = convolution2dLayer(3, 512, 'Padding', 'same');
relu7 = reluLayer();
conv8 = convolution2dLayer(3, 512, 'Padding', 'same');
relu8 = reluLayer();
pool4 = maxPooling2dLayer(2, 'Stride', 2);
conv9 = convolution2dLayer(3, 1024, 'Padding', 'same');
relu9 = reluLayer();
conv10 = convolution2dLayer(3, 1024, 'Padding', 'same');
relu10 = reluLayer();

tConv1 = transposedConv2dLayer(2, 512, 'Stride', 2);
cat1 = concatenationLayer(3);
conv11 = convolution2dLayer(3, 512, 'Padding', 'same');
relu11 = reluLayer();
conv12 = convolution2dLayer(3, 512, 'Padding', 'same');
relu12 = reluLayer();

tConv2 = transposedConv2dLayer(2, 256, 'Stride', 2);
cat2 = concatenationLayer(3);
conv13 = convolution2dLayer(3, 256, 'Padding', 'same');
relu13 = reluLayer();
conv14 = convolution2dLayer(3, 256, 'Padding', 'same');
relu14 = reluLayer();

tConv3 = transposedConv2dLayer(2, 128, 'Stride', 2);
cat3 = concatenationLayer(3);
conv15 = convolution2dLayer(3, 128, 'Padding', 'same');
relu15 = reluLayer();
conv16 = convolution2dLayer(3, 128, 'Padding', 'same');
relu16 = reluLayer();

tConv4 = transposedConv2dLayer(2, 64, 'Stride', 2);
cat4 = concatenationLayer(3);
conv17 = convolution2dLayer(3, 64, 'Padding', 'same');
relu17 = reluLayer();
conv18 = convolution2dLayer(3, 64, 'Padding', 'same');
relu18 = reluLayer();

outputLayer = convolution2dLayer(1, 1);
outputLayer.Name = 'output';

% 将网络结构组装成DAG网络
layers = [
    inputLayer
    conv1
    relu1
    conv2
    relu2
    pool1
    conv3
    relu3
    conv4
    relu4
    pool2
    conv5
    relu5
    conv6
    relu6
    pool3
    conv7
    relu7
    conv8
    relu8
    pool4
    conv9
    relu9
    conv10
    relu10
    tConv1
    cat1
    conv11
    relu11
    conv12
    relu12
    tConv2
    cat2
    conv13
    relu13
    conv14
    relu14
    tConv3
    cat3
    conv15
    relu15
    conv16
    relu16
    tConv4
    cat4
    conv17
    relu17
    conv18
    relu18
    outputLayer
];

% 定义UNET网络的连接结构
connections = [
    imageInputConnection(1, 'conv1')
    convolution2dConnection(5, 5, 64, 'conv1', 'conv2')
    convolution2dConnection(3, 3, 128, 'conv2', 'conv3')
    convolution2dConnection(3, 3, 256, 'conv3', 'conv4')
    convolution2dConnection(3, 3, 512, 'conv4', 'conv5')
    convolution2dConnection(3, 3, 1024, 'conv5', 'conv6')
    transposedConv2dConnection(2, 2, 512, 'conv6', 'tConv1')
    concatenationConnection('pool4', 'tConv1', 'cat1/in2')
    convolution2dConnection(3, 3, 512, 'cat1', 'conv11')
    convolution2dConnection(3, 3, 512, 'conv11', 'conv12')
    transposedConv2dConnection(2, 2, 256, 'conv12', 'tConv2')
    concatenationConnection('pool3', 'tConv2', 'cat2/in2')
    convolution2dConnection(3, 3, 256, 'cat2', 'conv13')
    convolution2dConnection(3, 3, 256, 'conv13', 'conv14')
    transposedConv2dConnection(2, 2, 128, 'conv14', 'tConv3')
    concatenationConnection('pool2', 'tConv3', 'cat3/in2')
    convolution2dConnection(3, 3, 128, 'cat3', 'conv15')
    convolution2dConnection(3, 3, 128, 'conv15', 'conv16')
    transposedConv2dConnection(2, 2, 64, 'conv16', 'tConv4')
    concatenationConnection('pool1', 'tConv4', 'cat4/in2')
    convolution2dConnection(3, 3, 64, 'cat4', 'conv17')
    convolution2dConnection(3, 3, 64, 'conv17', 'conv18')
    convolution2dConnection(1, 1, 1, 'conv18', 'output')
];

% 将网络结构和连接结构组装成DAG网络
lgraph = createLgraphUsingConnections(layers, connections);

% 展示UNET网络结构
plot(lgraph);

这个示例代码展示了如何使用MATLAB的深度学习工具箱中的函数定义一个简单的UNET网络结构和连接结构，并将它们组装成一个DAG网络。这个网络结构包含了多个跳跃连接，用于将低层次和高层次的特征信息结合起来，从而提高图像分割的准确性。