for epoch in range(100): loss_ls=[] for batch, (X, y) in enumerate(train_dataloader):

这是一段代码，它使用了一个 for 循环来遍历训练数据集 train_dataloader 中的每个 batch，并在每个 batch 上计算 loss。其中 epoch 表示遍历整个数据集的次数，而 batch 表示当前处理的 batch 的索引。loss_ls 用于记录每个 batch 的 loss 值，方便后续的可视化和分析。在 for 循环内部，X 表示当前 batch 的输入数据，y 表示当前 batch 的标签数据。

相关问题

检查一下：import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader, TensorDataset from sklearn.metrics import roc_auc_score # 定义神经网络模型 class Net(nn.Module): def __init__(self): super(Net, self).__init__() self.fc1 = nn.Linear(10, 64) self.fc2 = nn.Linear(64, 32) self.fc3 = nn.Linear(32, 1) self.sigmoid = nn.Sigmoid() def forward(self, x): x = self.fc1(x) x = nn.functional.relu(x) x = self.fc2(x) x = nn.functional.relu(x) x = self.fc3(x) x = self.sigmoid(x) return x # 加载数据集 data = torch.load('data.pt') x_train, y_train, x_test, y_test = data train_dataset = TensorDataset(x_train, y_train) train_loader = DataLoader(train_dataset, batch_size=32, shuffle=True) test_dataset = TensorDataset(x_test, y_test) test_loader = DataLoader(test_dataset, batch_size=32, shuffle=False) # 定义损失函数和优化器 criterion = nn.BCELoss() optimizer = optim.Adam(net.parameters(), lr=0.01) # 训练模型 net = Net() for epoch in range(10): running_loss = 0.0 for i, data in enumerate(train_loader): inputs, labels = data optimizer.zero_grad() outputs = net(inputs) loss = criterion(outputs, labels) loss.backward() optimizer.step() running_loss += loss.item() # 在测试集上计算AUC y_pred = [] y_true = [] with torch.no_grad(): for data in test_loader: inputs, labels = data outputs = net(inputs) y_pred += outputs.tolist() y_true += labels.tolist() auc = roc_auc_score(y_true, y_pred) print('Epoch %d, loss: %.3f, test AUC: %.3f' % (epoch + 1, running_loss / len(train_loader), auc))

在运行代码之前，需要将 `net = Net()` 放在 `optimizer = optim.Adam(net.parameters(), lr=0.01)` 的前面，因为在定义优化器时需要先传入模型的参数。另外，代码中没有定义 `net`，需要先将 `Net` 类定义好再进行实例化。正确的代码如下所示：

import torch
import torch.nn as nn
import torch.optim as optim
from torch.utils.data import DataLoader, TensorDataset
from sklearn.metrics import roc_auc_score

# 定义神经网络模型
class Net(nn.Module):
    def __init__(self):
        super(Net, self).__init__()
        self.fc1 = nn.Linear(10, 64)
        self.fc2 = nn.Linear(64, 32)
        self.fc3 = nn.Linear(32, 1)
        self.sigmoid = nn.Sigmoid()

    def forward(self, x):
        x = self.fc1(x)
        x = nn.functional.relu(x)
        x = self.fc2(x)
        x = nn.functional.relu(x)
        x = self.fc3(x)
        x = self.sigmoid(x)
        return x

# 加载数据集
data = torch.load('data.pt')
x_train, y_train, x_test, y_test = data
train_dataset = TensorDataset(x_train, y_train)
train_loader = DataLoader(train_dataset, batch_size=32, shuffle=True)
test_dataset = TensorDataset(x_test, y_test)
test_loader = DataLoader(test_dataset, batch_size=32, shuffle=False)

# 定义损失函数和优化器
criterion = nn.BCELoss()
net = Net()
optimizer = optim.Adam(net.parameters(), lr=0.01)

# 训练模型
for epoch in range(10):
    running_loss = 0.0
    for i, data in enumerate(train_loader):
        inputs, labels = data
        optimizer.zero_grad()
        outputs = net(inputs)
        loss = criterion(outputs, labels)
        loss.backward()
        optimizer.step()
        running_loss += loss.item()

    # 在测试集上计算AUC
    y_pred = []
    y_true = []
    with torch.no_grad():
        for data in test_loader:
            inputs, labels = data
            outputs = net(inputs)
            y_pred += outputs.tolist()
            y_true += labels.tolist()

    auc = roc_auc_score(y_true, y_pred)
    print('Epoch %d, loss: %.3f, test AUC: %.3f' % (epoch + 1, running_loss / len(train_loader), auc))

给你提供了完整代码，但在运行以下代码时出现上述错误，该如何解决？Batch_size = 9 DataSet = DataSet(np.array(x_train), list(y_train)) train_size = int(len(x_train)*0.8) test_size = len(y_train) - train_size train_dataset, test_dataset = torch.utils.data.random_split(DataSet, [train_size, test_size]) TrainDataloader = Data.DataLoader(train_dataset, batch_size=Batch_size, shuffle=False, drop_last=True) TestDataloader = Data.DataLoader(test_dataset, batch_size=Batch_size, shuffle=False, drop_last=True) model = Transformer(n_encoder_inputs=3, n_decoder_inputs=3, Sequence_length=1).to(device) epochs = 10 optimizer = torch.optim.Adam(model.parameters(), lr=0.0001) criterion = torch.nn.MSELoss().to(device) val_loss = [] train_loss = [] best_best_loss = 10000000 for epoch in tqdm(range(epochs)): train_epoch_loss = [] for index, (inputs, targets) in enumerate(TrainDataloader): inputs = torch.tensor(inputs).to(device) targets = torch.tensor(targets).to(device) inputs = inputs.float() targets = targets.float() tgt_in = torch.rand((Batch_size, 1, 3)) outputs = model(inputs, tgt_in) loss = criterion(outputs.float(), targets.float()) print("loss", loss) loss.backward() optimizer.step() train_epoch_loss.append(loss.item()) train_loss.append(np.mean(train_epoch_loss)) val_epoch_loss = _test() val_loss.append(val_epoch_loss) print("epoch:", epoch, "train_epoch_loss:", train_epoch_loss, "val_epoch_loss:", val_epoch_loss) if val_epoch_loss < best_best_loss: best_best_loss = val_epoch_loss best_model = model print("best_best_loss ---------------------------", best_best_loss) torch.save(best_model.state_dict(), 'best_Transformer_trainModel.pth')

根据你提供的完整代码，错误信息可能是在以下部分出现问题：

for index, (inputs, targets) in enumerate(TrainDataloader):
    # ...
    tgt_in = torch.rand((Batch_size, 1, 3))
    outputs = model(inputs, tgt_in)
    # ...

你在每次循环中都使用 `torch.rand` 函数生成了一个形状为 `(Batch_size, 1, 3)` 的随机张量 `tgt_in`，然后将其作为模型的输入之一。然而，这个随机张量的维度不匹配模型的期望输入维度。

为了解决这个问题，你可以将 `tgt_in` 的维度调整为与模型期望的维度相匹配。根据你之前提供的信息，`n_decoder_inputs` 是模型期望的输入维度，因此可以使用 `torch.rand` 生成一个形状为 `(Batch_size, n_decoder_inputs, Sequence_length)` 的随机张量。根据你的代码，`n_decoder_inputs` 和 `Sequence_length` 都是 3，所以你可以将以下行：

tgt_in = torch.rand((Batch_size, 1, 3))

更改为：

tgt_in = torch.rand((Batch_size, 3, 1))

这样，`tgt_in` 的维度就与模型的期望输入维度匹配了。请尝试进行这个修改并重新运行代码，看看是否能够解决错误。