84 lines
2.2 KiB
Python
84 lines
2.2 KiB
Python
import torch
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import torch.nn as nn
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import torch.nn.functional as F
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class FoodCNN(nn.Module):
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"""
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食物分类CNN模型
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基于CIFAR10结构，适配3分类任务
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"""
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def __init__(self):
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super(FoodCNN, self).__init__()
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# 第一个卷积块
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self.conv1 = nn.Conv2d(3, 32, 3, padding=1)
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self.conv2 = nn.Conv2d(32, 32, 3, padding=1)
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self.pool1 = nn.MaxPool2d(2, 2)
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self.dropout1 = nn.Dropout2d(0.25)
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# 第二个卷积块
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self.conv3 = nn.Conv2d(32, 64, 3, padding=1)
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self.conv4 = nn.Conv2d(64, 64, 3, padding=1)
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self.pool2 = nn.MaxPool2d(2, 2)
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self.dropout2 = nn.Dropout2d(0.25)
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# 第三个卷积块
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self.conv5 = nn.Conv2d(64, 128, 3, padding=1)
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self.conv6 = nn.Conv2d(128, 128, 3, padding=1)
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self.pool3 = nn.MaxPool2d(2, 2)
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self.dropout3 = nn.Dropout2d(0.25)
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# 全连接层
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self.fc1 = nn.Linear(128 * 4 * 4, 512)
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self.dropout4 = nn.Dropout(0.5)
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self.fc2 = nn.Linear(512, 3) # 3分类
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def forward(self, x):
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# 第一个卷积块
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x = F.relu(self.conv1(x))
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x = F.relu(self.conv2(x))
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x = self.pool1(x)
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x = self.dropout1(x)
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# 第二个卷积块
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x = F.relu(self.conv3(x))
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x = F.relu(self.conv4(x))
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x = self.pool2(x)
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x = self.dropout2(x)
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# 第三个卷积块
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x = F.relu(self.conv5(x))
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x = F.relu(self.conv6(x))
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x = self.pool3(x)
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x = self.dropout3(x)
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# 展平
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x = x.view(-1, 128 * 4 * 4)
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# 全连接层
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x = F.relu(self.fc1(x))
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x = self.dropout4(x)
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x = self.fc2(x)
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return x
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def create_food_cnn():
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"""
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创建食物分类CNN模型
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Returns:
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FoodCNN: 网络模型实例
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"""
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return FoodCNN()
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if __name__ == "__main__":
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# 测试网络
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model = create_food_cnn()
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print(f"模型参数数量: {sum(p.numel() for p in model.parameters() if p.requires_grad)}")
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# 测试前向传播
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dummy_input = torch.randn(1, 3, 32, 32)
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output = model(dummy_input)
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print(f"输出形状: {output.shape}") |