yolov5的neck部分介绍
时间: 2023-11-21 08:59:20 浏览: 218
YOLOv5的Neck部分是由C3模块组成的,C3模块是一种不带残差的卷积模块,它由三个卷积层组成,每个卷积层的卷积核大小为3x3,步长为2,其中第一个卷积层的输出通道数为输入通道数的一半,后面两个卷积层的输出通道数相同。C3模块的设计旨在提高特征图的分辨率和感受野,同时减少计算量和参数数量。
下面是一个使用C3模块的Neck结构的示例代码:
```python
import torch.nn as nn
class YOLOv5Neck(nn.Module):
def __init__(self, in_channels, out_channels):
super(YOLOv5Neck, self).__init__()
self.conv1 = nn.Conv2d(in_channels, out_channels // 2, kernel_size=1, stride=1, padding=0)
self.conv2 = nn.Conv2d(out_channels // 2, out_channels, kernel_size=3, stride=2, padding=1)
self.conv3 = nn.Conv2d(out_channels, out_channels, kernel_size=1, stride=1, padding=0)
self.act = nn.LeakyReLU(0.1, inplace=True)
def forward(self, x):
x = self.conv1(x)
x = self.act(x)
x = self.conv2(x)
x = self.act(x)
x = self.conv3(x)
x = self.act(x)
return x
```
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