用pytorch写一段代码:用CNN网络对电机轴承的一维振动信号做故障诊断,包括:正常、滚动体故障、外圈故障、内圈故障共四类状态,实现给定真实振动信号判别故障类别
时间: 2023-03-03 16:10:51 浏览: 97
好的,以下是使用 PyTorch 实现的一维振动信号故障诊断代码:
```
import torch
import torch.nn as nn
import torch.optim as optim
# 定义 CNN 模型
class Net(nn.Module):
def __init__(self):
super(Net, self).__init__()
self.conv1 = nn.Conv1d(1, 16, 64, stride=4)
self.pool1 = nn.MaxPool1d(2)
self.conv2 = nn.Conv1d(16, 32, 3)
self.pool2 = nn.MaxPool1d(2)
self.conv3 = nn.Conv1d(32, 64, 3)
self.fc1 = nn.Linear(64 * 4, 128)
self.fc2 = nn.Linear(128, 4)
def forward(self, x):
x = self.pool1(torch.relu(self.conv1(x)))
x = self.pool2(torch.relu(self.conv2(x)))
x = torch.relu(self.conv3(x))
x = x.view(-1, 64 * 4)
x = torch.relu(self.fc1(x))
x = self.fc2(x)
return x
# 定义数据
train_data = ...
train_label = ...
test_data = ...
test_label = ...
# 将数据转换为 PyTorch 中的 Tensor
train_data = torch.from_numpy(train_data).float()
train_label = torch.from_numpy(train_label).long()
test_data = torch.from_numpy(test_data).float()
test_label = torch.from_numpy(test_label).long()
# 定义模型、损失函数和优化器
model = Net()
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(model.parameters(), lr=0.001, momentum=0.9)
# 训练模型
for epoch in range(100):
running_loss = 0.0
for i in range(len(train_data)):
optimizer.zero_grad()
outputs = model(train_data[i].unsqueeze(0))
loss = criterion(outputs, train_label[i].unsqueeze(0))
loss.backward()
optimizer.step()
running_loss += loss.item()
print('Epoch %d loss: %.3f' % (epoch + 1, running_loss / len(train_data)))
# 测试模型
correct = 0
total = 0
with torch.no_grad():
for i in range(len(test_data)):
outputs = model(test_data[i].unsqueeze(0))
_, predicted = torch.max(outputs.data, 1)
total += 1
correct += (predicted == test_label[i]).sum().item()
print('Accuracy: %.2f %%' % (100 * correct / total))
```
在这个代码中,我们首先定义了一个包含三个卷积层和两个全连接层的 CNN 模型。接下来,我们将训练数据和测试数据转换为 PyTorch 中的 Tensor,并定义了损失函数和优化器。然后,我们使用这些数据训练模型,并在每个 epoch 结束时输出训练损失。最后,我们使用测试数据测试模型的准确率。
注意,在这个代码中,我们假设数据已经被正确处理为一维振动信号,并已经被分成了四类,分别是正常、滚动体故障、外圈