99 lines
3.6 KiB
Python
99 lines
3.6 KiB
Python
"""
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这个文件是模型的定义文件，请不要擅自修改，如有疑问微信群里反馈
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单独运行本文件将会输出模型结构
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目前的话是一个36层的模型，模型总量应该是在80M左右 如果到时候还是欠拟合的话再考虑去做更深的结构
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author : yukun-hh
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date : 2026-4-10
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"""
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#神经网络模型库
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import torch
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from torch import nn
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from torch.nn import functional as F
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from torchsummary import summary
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#残差块
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class Resblock(nn.Module):
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def __init__(self, input_channels,output_channels,use_1x1conv=False,strides=1):
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"""
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:param input_channels: 进入残差块时的原通道
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:param output_channels: 输出时的通道数
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:param use_1x1conv: 如果输入和输出通道不相等时，需要用一个1x1的卷积层对原来的输入进行一个通道提升
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:param strides: 默认1，如果大于1起到缩小张量的作用
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"""
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super().__init__()
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self.conv1 = nn.Conv2d(input_channels,output_channels,kernel_size=3,padding=1,stride=strides)
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self.conv2 = nn.Conv2d(output_channels,output_channels,kernel_size=3,padding=1,stride=1)
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if use_1x1conv:
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self.conv3 = nn.Conv2d(input_channels, output_channels,kernel_size=1, stride=strides)
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else:
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self.conv3 = None
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self.bn1 = nn.BatchNorm2d(output_channels)
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self.bn2 = nn.BatchNorm2d(output_channels)
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def forward(self,X):
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Y = F.relu(self.bn1(self.conv1(X)))
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Y = self.bn2(self.conv2(Y))
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if self.conv3 is not None:
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X = self.conv3(X)
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Y += X
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return F.relu(Y)
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class Net():
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"""
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模型的主要结构就在这里了，到时也好该和调用
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现在必须实现的方法：
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目前还是以图片缩放到256＊256构建残差块
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"""
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net = nn.Sequential()
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def resnet_block(self,input_channels, num_channels, num_residuals,
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first_block=False):
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"""
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:param input_channels: 输入维度
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:param num_channels: 输出维度
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:param num_residuals: 单个残差层的残差块数
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:param first_block: 第一块不用下采样 特殊控制
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:return: list[nn.Module]
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"""
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blk = []
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for i in range(num_residuals):
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if i == 0 and not first_block:
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blk.append(Resblock(input_channels, num_channels,
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use_1x1conv=True, strides=2))
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else:
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blk.append(Resblock(num_channels, num_channels))
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return blk
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def __init__(self):
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b1 = nn.Sequential( nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3),
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nn.BatchNorm2d(64), nn.ReLU(),
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nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
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)
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"""
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7×7 卷积层，输出通道 64，步长 2，填充 3
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(3×256×256)->(64×128×128)
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批归一化 relu层
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最大池化
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(64×128×128)->(64×64×64)
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"""
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b2 = nn.Sequential(*self.resnet_block(64, 64, num_residuals=3, first_block=True))
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b3 = nn.Sequential(*self.resnet_block(64, 128, num_residuals=4))
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b4 = nn.Sequential(*self.resnet_block(128, 256, num_residuals=6))
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b5 = nn.Sequential(*self.resnet_block(256, 512, num_residuals=3))
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self.net = nn.Sequential(b1, b2, b3, b4, b5,nn.AdaptiveAvgPool2d((1,1)),nn.Flatten(), nn.Linear(512, 4))
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def get_network(self):
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return self.net
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if __name__ == '__main__':
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Net_new = Net()
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X = torch.rand(size=(1, 3, 256, 256))
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summary(Net_new.get_network(), input_size=(3, 256, 256))
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