self.sigmoid = nn.Sigmoid()
时间: 2024-05-16 17:19:54 浏览: 10
这也是一个典型的神经网络层的定义,其中nn.Sigmoid()表示使用Sigmoid激活函数。Sigmoid函数将任意实数映射到[0,1]区间,常用于二分类问题中作为输出层的激活函数,它能够将输出值转化为概率值,表示某个样本属于正类的概率。在这个例子中,self.sigmoid是一个Sigmoid层,可以用于输出层的激活函数。
相关问题
class SelfAttention(nn.Module): def __init__(self, in_channels, reduction=4): super(SelfAttention, self).__init__() self.avg_pool = nn.AdaptiveAvgPool1d(1) # print("in_channels", in_channels) self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False) self.relu = nn.ReLU(inplace=True) self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, n = x.size() y = self.avg_pool(x) print("y.shape=", y.shape) # print("in_channels", in_channels) y = self.fc1(y) y = self.relu(y) y = self.fc2(y) y = self.sigmoid(y) return x * y.expand_as(x)我想在这个类中实现将传入的参数进行打印,你可以给我详细的代码吗?
你可以在 `__init__` 方法中添加以下代码:
```
print("in_channels:", in_channels)
print("reduction:", reduction)
```
在 `forward` 方法中添加以下代码:
```
print("x.shape:", x.shape)
```
这样就可以在打印的信息中看到传入的参数和输入的张量形状了。完整的代码如下:
```
class SelfAttention(nn.Module):
def __init__(self, in_channels, reduction=4):
super(SelfAttention, self).__init__()
self.avg_pool = nn.AdaptiveAvgPool1d(1) #
print("in_channels:", in_channels)
print("reduction:", reduction)
self.fc1 = nn.Conv1d(in_channels, in_channels // reduction, 1, bias=False)
self.relu = nn.ReLU(inplace=True)
self.fc2 = nn.Conv1d(in_channels // reduction, in_channels, 1, bias=False)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
print("x.shape:", x.shape)
b, c, n = x.size()
y = self.avg_pool(x)
print("y.shape=", y.shape) #
y = self.fc1(y)
y = self.relu(y)
y = self.fc2(y)
y = self.sigmoid(y)
return x * y.expand_as(x)
```
更改import torch import torchvision.models as models import torch.nn as nn import torch.nn.functional as F class eca_Resnet50(nn.Module): def init(self): super().init() self.model = models.resnet50(pretrained=True) self.model.avgpool = nn.AdaptiveAvgPool2d((1,1)) self.model.fc = nn.Linear(2048, 1000) self.eca = ECA_Module(2048, 8) def forward(self, x): x = self.model.conv1(x) x = self.model.bn1(x) x = self.model.relu(x) x = self.model.maxpool(x) x = self.model.layer1(x) x = self.model.layer2(x) x = self.model.layer3(x) x = self.model.layer4(x) x = self.eca(x) x = self.model.avgpool(x) x = torch.flatten(x, 1) x = self.model.fc(x) return x class ECA_Module(nn.Module): def init(self, channel, k_size=3): super(ECA_Module, self).init() self.avg_pool = nn.AdaptiveAvgPool2d(1) self.conv = nn.Conv1d(1, 1, kernel_size=k_size, padding=(k_size - 1) // 2, bias=False) self.sigmoid = nn.Sigmoid() def forward(self, x): b, c, _, _ = x.size() y = self.avg_pool(x) y = self.conv(y.squeeze(-1).transpose(-1,-2)).transpose(-1,-2).unsqueeze(-1) y = self.sigmoid(y) return x * y.expand_as(x) class ImageDenoising(nn.Module): def init(self): super().init() self.model = eca_Resnet50() self.conv1 = nn.Conv2d(3, 64, kernel_size=3, stride=1, padding=1) self.conv2 = nn.Conv2d(64, 64, kernel_size=3, stride=1, padding=1) self.conv3 = nn.Conv2d(64, 3, kernel_size=3, stride=1, padding=1) def forward(self, x): x = self.conv1(x) x = F.relu(x) x = self.conv2(x) x = F.relu(x) x = self.conv3(x) x = F.relu(x) return x,使最后输出为[16,1,50,50,]。
更改后的代码如下:
```
import torch
import torchvision.models as models
import torch.nn as nn
import torch.nn.functional as F
class eca_Resnet50(nn.Module):
def __init__(self):
super().__init__()
self.model = models.resnet50(pretrained=True)
self.model.avgpool = nn.AdaptiveAvgPool2d((1,1))
self.model.fc = nn.Linear(2048, 1000)
self.eca = ECA_Module(2048, 8)
def forward(self, x):
x = self.model.conv1(x)
x = self.model.bn1(x)
x = self.model.relu(x)
x = self.model.maxpool(x)
x = self.model.layer1(x)
x = self.model.layer2(x)
x = self.model.layer3(x)
x = self.model.layer4(x)
x = self.eca(x)
x = self.model.avgpool(x)
x = torch.flatten(x, 1)
x = self.model.fc(x)
return x
class ECA_Module(nn.Module):
def __init__(self, channel, k_size=3):
super().__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
self.conv = nn.Conv1d(1, 1, kernel_size=k_size, padding=(k_size - 1) // 2, bias=False)
self.sigmoid = nn.Sigmoid()
def forward(self, x):
b, c, _, _ = x.size()
y = self.avg_pool(x)
y = self.conv(y.squeeze(-1).transpose(-1,-2)).transpose(-1,-2).unsqueeze(-1)
y = self.sigmoid(y)
return x * y.expand_as(x)
class ImageDenoising(nn.Module):
def __init__(self):
super().__init__()
self.model = eca_Resnet50()
self.conv1 = nn.Conv2d(3, 64, kernel_size=3, stride=1, padding=1)
self.conv2 = nn.Conv2d(64, 64, kernel_size=3, stride=1, padding=1)
self.conv3 = nn.Conv2d(64, 1, kernel_size=3, stride=1, padding=1)
def forward(self, x):
x = self.conv1(x)
x = F.relu(x)
x = self.conv2(x)
x = F.relu(x)
x = self.conv3(x)
x = F.relu(x)
x = x.view(-1, 1, 50, 50)
return x
```
在修改的过程中,主要是将最后一层卷积层的输出通道数改为 1,并在 forward 方法中添加了 x.view(-1, 1, 50, 50),将输出的大小修改为 [16,1,50,50]。