yolov8轻量化改进代码

你可以在以下代码片段中找到YOLOv8轻量化改进的示例代码：

import torch
import torch.nn as nn
import torch.nn.functional as F

class ConvBlock(nn.Module):
    def __init__(self, in_channels, out_channels, kernel_size, stride, padding):
        super(ConvBlock, self).__init__()
        self.conv = nn.Conv2d(in_channels, out_channels, kernel_size, stride, padding)
        self.bn = nn.BatchNorm2d(out_channels)
        self.relu = nn.ReLU(inplace=True)

    def forward(self, x):
        x = self.conv(x)
        x = self.bn(x)
        x = self.relu(x)
        return x

class YOLOv8Lite(nn.Module):
    def __init__(self, num_classes=80):
        super(YOLOv8Lite, self).__init__()
        self.num_classes = num_classes

        # Backbone
        self.conv1 = ConvBlock(3, 16, kernel_size=3, stride=1, padding=1)
        self.conv2 = ConvBlock(16, 32, kernel_size=3, stride=2, padding=1)
        self.conv3 = ConvBlock(32, 64, kernel_size=3, stride=2, padding=1)
        self.conv4 = ConvBlock(64, 128, kernel_size=3, stride=2, padding=1)

        # Head
        self.conv5 = ConvBlock(128, 256, kernel_size=3, stride=2, padding=1)
        self.fc1 = nn.Linear(256 * 7 * 7, 4096)
        self.fc2 = nn.Linear(4096, 7 * 7 * (5 + self.num_classes))

    def forward(self, x):
        x = self.conv1(x)
        x = self.conv2(x)
        x = self.conv3(x)
        x = self.conv4(x)
        x = self.conv5(x)
        x = x.view(x.size(0), -1)
        x = self.fc1(x)
        x = self.fc2(x)
        x = x.view(x.size(0), 7, 7, 5 + self.num_classes)
        return x

model = YOLOv8Lite()

这是一个简化版的YOLOv8模型，使用了较少的卷积层和全连接层。你可以根据需要修改网络结构和超参数。请注意，这只是一个示例代码，可能需要根据你的具体任务进行调整。