output1_0 = self.level2_0(output0_cat)
时间: 2023-05-12 17:06:20 浏览: 56
这是一个神经网络的前向传播过程中的一行代码,其中 self.level2_0 是一个神经网络的层,output0_cat 是前一层的输出。这行代码的作用是将前一层的输出作为输入,经过 self.level2_0 层的计算,得到 output1_0。具体的计算过程需要查看 self.level2_0 层的具体实现。
相关问题
Traceback (most recent call last): File "E:/pycharm/AHEcode/train.py", line 229, in <module> outputs = model(images) File "E:\conda\CONDA\envs\hu-torch\lib\site-packages\torch\nn\modules\module.py", line 1130, in _call_impl return forward_call(*input, **kwargs) File "E:/pycharm/AHEcode/train.py", line 63, in forward x_final = torch.cat([x3_flat, lbp_output], dim=1) # 将 x3_flat 和 lbp_output 拼接 RuntimeError: Sizes of tensors must match except in dimension 1. Expected size 6272 but got size 8 for tensor number 1 in the list.完整的代码如下: def forward(self, x): x1 = F.relu(self.bn1(torch.cat([self.conv1_3x3(x), self.conv1_5x5(x), self.conv1_7x7(x)], dim=1))) x1 = F.max_pool2d(x1, 2) x2 = F.relu(self.bn2(torch.cat([self.conv2_3x3(x1), self.conv2_5x5(x1), self.conv2_7x7(x1)], dim=1))) x2 = F.max_pool2d(x2, 2) x3 = F.relu(self.bn3(torch.cat([self.conv3_3x3(x2), self.conv3_5x5(x2), self.conv3_7x7(x2)], dim=1))) x3 = F.max_pool2d(x3, 2) x3_flat = x3.view(-1, 768) print(f'x3_flat size: {x3_flat.size()}') clahe_output = self.clahe_module(x) print(clahe_output.shape) lbp_output = self.lbp_layer(clahe_output) print(f'lbp_output size: {lbp_output.size()}') lbp_output = lbp_output.to(x3_flat.device) # print(f'lbp_output expanded size: {lbp_output.size()}') x_final = torch.cat([x3_flat, lbp_output], dim=1) # 将 x3_flat 和 lbp_output 拼接 output = self.fc(x_final) # 全连接层得到最终的输出 return output
这个错误是因为在 torch.cat 操作中,除了第 1 维度以外,其他维度的大小应该是相同的,但是在你的代码中,x3_flat 的大小是 [batch_size, 768],而 lbp_output 的大小是 [batch_size, 1, height, width],没有经过展平操作,因此维度不匹配。你可以将 lbp_output 展平成 [batch_size, height*width],然后再进行拼接操作。修改后的代码如下:
```
def forward(self, x):
x1 = F.relu(self.bn1(torch.cat([self.conv1_3x3(x), self.conv1_5x5(x), self.conv1_7x7(x)], dim=1)))
x1 = F.max_pool2d(x1, 2)
x2 = F.relu(self.bn2(torch.cat([self.conv2_3x3(x1), self.conv2_5x5(x1), self.conv2_7x7(x1)], dim=1)))
x2 = F.max_pool2d(x2, 2)
x3 = F.relu(self.bn3(torch.cat([self.conv3_3x3(x2), self.conv3_5x5(x2), self.conv3_7x7(x2)], dim=1)))
x3 = F.max_pool2d(x3, 2)
x3_flat = x3.view(-1, 768)
print(f'x3_flat size: {x3_flat.size()}')
clahe_output = self.clahe_module(x)
print(clahe_output.shape)
lbp_output = self.lbp_layer(clahe_output)
lbp_output = lbp_output.view(lbp_output.size(0), -1) # 将 lbp_output 展平
print(f'lbp_output size: {lbp_output.size()}')
lbp_output = lbp_output.to(x3_flat.device)
x_final = torch.cat([x3_flat, lbp_output], dim=1) # 将 x3_flat 和 lbp_output 拼接
output = self.fc(x_final) # 全连接层得到最终的输出
return output
```
这样修改后,应该就可以正常运行了。
import torch import torch.nn as nn import torch.nn.functional as F import torchvision.models as models import os class FCNTransformerNet(nn.Module): def __init__(self, num_classes): super(FCNTransformerNet, self).__init__() self.fcn_backbone = models.segmentation.fcn_resnet50(pretrained=True).backbone self.fcn_backbone.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False) self.transformer_layers = nn.TransformerEncoderLayer(d_model=2048, nhead=8) self.transformer_encoder = nn.TransformerEncoder(self.transformer_layers, num_layers=6) self.classification_head = nn.Sequential( nn.Linear(2048, 512), nn.ReLU(), nn.Linear(512, num_classes) ) def forward(self, x): fcn_output = self.fcn_backbone(x)['out'] fcn_output = fcn_output.view(fcn_output.size(0), fcn_output.size(1), -1) fcn_output = fcn_output.permute(2, 0, 1) transformer_output = self.transformer_encoder(fcn_output) transformer_output = transformer_output.permute(1, 2, 0) transformer_output = transformer_output.contiguous().view(transformer_output.size(0), -1, 1, 1) output = self.classification_head(transformer_output) return output FCNTransformerNet net = FCNTransformerNet(num_classes=2) input_batch = torch.randn(4, 3, 512, 512) output_batch = net(input_batch) print(output_batch.size()) # Should print: torch.Size([4, 2, 512, 512]) 运行这段代码,并改错
在这段代码中,有几个问题需要进行修正。
首先,你定义了一个名为 `FCNTransformerNet` 的类,但是没有在代码末尾实例化这个类。你需要添加 `()` 来实例化该类,将其赋值给变量 `net`。
其次,你需要将 `FCNTransformerNet` 类的定义放在 `if __name__ == "__main__":` 条件语句内部,以确保它只在主程序中运行,而不是在模块导入时运行。
最后,你的代码中缺少了一些必要的导入语句。你需要导入 `torch`, `torch.nn` 和 `torchvision.models`。
下面是修改后的代码:
```python
import torch
import torch.nn as nn
import torchvision.models as models
class FCNTransformerNet(nn.Module):
def __init__(self, num_classes):
super(FCNTransformerNet, self).__init__()
self.fcn_backbone = models.segmentation.fcn_resnet50(pretrained=True).backbone
self.fcn_backbone.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False)
self.transformer_layers = nn.TransformerEncoderLayer(d_model=2048, nhead=8)
self.transformer_encoder = nn.TransformerEncoder(self.transformer_layers, num_layers=6)
self.classification_head = nn.Sequential(
nn.Linear(2048, 512),
nn.ReLU(),
nn.Linear(512, num_classes)
)
def forward(self, x):
fcn_output = self.fcn_backbone(x)['out']
fcn_output = fcn_output.view(fcn_output.size(0), fcn_output.size(1), -1)
fcn_output = fcn_output.permute(2, 0, 1)
transformer_output = self.transformer_encoder(fcn_output)
transformer_output = transformer_output.permute(1, 2, 0)
transformer_output = transformer_output.contiguous().view(transformer_output.size(0), -1, 1, 1)
output = self.classification_head(transformer_output)
return output
if __name__ == "__main__":
net = FCNTransformerNet(num_classes=2)
input_batch = torch.randn(4, 3, 512, 512)
output_batch = net(input_batch)
print(output_batch.size()) # Should print: torch.Size([4, 2, 512, 512])
```
请注意,这段代码假设你已经正确安装了 `torch` 和 `torchvision` 库。如果出现任何错误,你可能需要检查这些库的安装情况。