在nn.LSTM pytorch中进行R2评分的方法如下:
import torch
import torch.nn as nn
class LSTMModel(nn.Module):
def __init__(self, input_size, hidden_size, num_layers, output_size):
super(LSTMModel, self).__init__()
self.hidden_size = hidden_size
self.num_layers = num_layers
self.lstm = nn.LSTM(input_size, hidden_size, num_layers, batch_first=True)
self.fc = nn.Linear(hidden_size, output_size)
def forward(self, x):
h0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size).to(device)
c0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size).to(device)
out, _ = self.lstm(x, (h0, c0))
out = self.fc(out[:, -1, :])
return out
在这个例子中,我们定义了一个LSTM模型,其中包含一个LSTM层和一个全连接层。
input_size = 1
hidden_size = 32
num_layers = 2
output_size = 1
model = LSTMModel(input_size, hidden_size, num_layers, output_size)
model.to(device)
criterion = nn.MSELoss()
optimizer = torch.optim.SGD(model.parameters(), lr=0.01)
num_epochs = 100
for epoch in range(num_epochs):
model.train()
outputs = model(inputs)
loss = criterion(outputs, labels)
optimizer.zero_grad()
loss.backward()
optimizer.step()
model.eval()
with torch.no_grad():
predicted = model(test_inputs)
r2_score = 1 - (torch.sum((predicted - test_labels) ** 2) / torch.sum((test_labels - torch.mean(test_labels)) ** 2))
print("R2 Score: {:.2f}".format(r2_score.item()))
在这个例子中,我们使用torch.mean计算了测试标签的均值,并使用torch.sum计算了预测值和测试标签之间的平方差的总和。然后,我们使用这些值计算了R2评分。
这是一个基本的在nn.LSTM pytorch中进行R2评分的方法。根据具体的应用场景和数据集特点,你可能需要进行一些调整和优化。
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