import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader, TensorDataset class LSTM(nn.Module): def __init__(self, inputDim, hiddenDim, layerNum, batchSize): super(LSTM, self).__init__() self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu") self.inputDim = inputDim self.hiddenDim = hiddenDim self.layerNum = layerNum self.batchSize = batchSize self.lstm = nn.LSTM(inputDim, hiddenDim, layerNum, batch_first = True).to(self.device) self.fc = nn.Linear(hiddenDim, 1).to(self.device) def forward(self, inputData): h0 = torch.zeros(self.layerNum, inputData.size(0), self.hiddenDim, device = inputData.device) c0 = torch.zeros(self.layerNum, inputData.size(0), self.hiddenDim, device = inputData.device) out, hidden = self.lstm(inputData, (h0, c0)) out = self.fc(out[:, -1, :]) return out def SetCriterion(self, func): self.criterion = func def SetOptimizer(self, func): self.optimizer = func def SetLstmTrainData(self, inputData, labelData): data = TensorDataset(inputData.to(device), labelData.to(device)) self.dataloader = DataLoader(data, batch_size = self.batchSize, shuffle = True) def TrainLstmModule(self, epochNum, learnRate, statPeriod): for epoch in range(epochNum): for batch_x, batch_y in self.dataloader: self.optimizer.zero_grad() output = self.forward(batch_x) loss = self.criterion(output, batch_y) loss.backward() self.optimizer.step() if epoch % statPeriod == 0: print("Epoch[{}/{}], loss:{:.6f}".format(epoch + 1, epochNum, loss.item())) def GetLstmModuleTrainRst(self, verifyData): results = [] with torch.no_grad(): output = self.forward(verifyData) results = output.squeeze().tolist() # 将预测结果转换为 Python 列表 return results if __name__ == "__main__": inputDataNum = 100 timeStep = 5 inputDataDim = 10000 labelDataDim = 1 hiddenDataDim = 200 layerNum = 20 trainBatchSize = 100 epochNum = 1 learnRate = 0.01 statPeriod = 1 weightDecay = 0.001 device = torch.device("cuda" if torch.cuda.is_available() else "cpu") model = LSTM(inputDataDim, hiddenDataDim, layerNum, trainBatchSize).to(device) model.SetCriterion(nn.MSELoss()) model.SetOptimizer(torch.optim.Adam(model.parameters(), lr = learnRate, weight_decay = weightDecay)) inputData = torch.randn(inputDataNum, timeStep, inputDataDim) labelData = torch.randn(inputDataNum, labelDataDim) verifyData = inputData model.SetLstmTrainData(inputData, labelData) model.TrainLstmModule(epochNum, learnRate, statPeriod) torch.save(model.state_dict(), "lstm_model.pth") model.load_state_dict(torch.load("lstm_model.pth")) model.GetLstmModuleTrainRst(verifyData)

这是一个使用 LSTM 模型进行训练和预测的代码。它使用PyTorch库实现了一个LSTM类，其中包含了LSTM模型的定义、前向传播、损失函数和优化器的设置，以及训练和预测的方法。

在代码中，LSTM模型接受输入数据的维度、隐藏层维度、层数和批次大小作为参数进行初始化。在前向传播中，它使用LSTM层和全连接层对输入数据进行处理，并返回预测结果。

模型可以通过SetCriterion方法设置损失函数，通过SetOptimizer方法设置优化器。使用SetLstmTrainData方法将训练数据和标签数据传入模型，并通过TrainLstmModule方法进行模型训练。

GetLstmModuleTrainRst方法用于获取模型在验证数据上的预测结果。

在主函数中，定义了输入数据的维度、时间步长、隐藏层维度、层数、训练批次大小、训练轮数、学习率和统计周期等参数。然后创建了一个LSTM模型对象，并设置了损失函数和优化器。接着生成了随机的输入数据和标签数据，并调用SetLstmTrainData方法将其传入模型。最后调用TrainLstmModule方法进行模型训练，并保存模型参数到文件中。

如果你有任何问题，请随时问我。

相关问题

import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader, TensorDataset class LSTM(nn.Module): def __init__(self, inputDim, hiddenDim, layerNum, batchSize): super(LSTM, self).__init__()

你在这段代码中定义了一个名为LSTM的类，继承自torch.nn.Module。这个类用于构建一个LSTM模型。在初始化方法中，你传入了inputDim（输入维度）、hiddenDim（隐藏层维度）、layerNum（LSTM层数）和batchSize（批次大小）等参数。super()函数用于调用父类的初始化方法。接下来的代码缺失了，请提供完整的代码。

这段代码中加一个test loss功能 class LSTM(nn.Module): def __init__(self, input_size, hidden_size, num_layers, output_size, batch_size, device): super().__init__() self.device = device self.input_size = input_size self.hidden_size = hidden_size self.num_layers = num_layers self.output_size = output_size self.num_directions = 1 # 单向LSTM self.batch_size = batch_size self.lstm = nn.LSTM(self.input_size, self.hidden_size, self.num_layers, batch_first=True) self.linear = nn.Linear(65536, self.output_size) def forward(self, input_seq): h_0 = torch.randn(self.num_directions * self.num_layers, self.batch_size, self.hidden_size).to(self.device) c_0 = torch.randn(self.num_directions * self.num_layers, self.batch_size, self.hidden_size).to(self.device) output, _ = self.lstm(input_seq, (h_0, c_0)) pred = self.linear(output.contiguous().view(self.batch_size, -1)) return pred if __name__ == '__main__': # 加载已保存的模型参数 saved_model_path = '/content/drive/MyDrive/危急值/model/dangerous.pth' device = 'cuda:0' lstm_model = LSTM(input_size=1, hidden_size=64, num_layers=1, output_size=3, batch_size=256, device='cuda:0').to(device) state_dict = torch.load(saved_model_path) lstm_model.load_state_dict(state_dict) dataset = ECGDataset(X_train_df.to_numpy()) dataloader = DataLoader(dataset, batch_size=256, shuffle=True, num_workers=0, drop_last=True) loss_fn = nn.CrossEntropyLoss() optimizer = optim.SGD(lstm_model.parameters(), lr=1e-4) for epoch in range(200000): print(f'epoch:{epoch}') lstm_model.train() epoch_bar = tqdm(dataloader) for x, y in epoch_bar: optimizer.zero_grad() x_out = lstm_model(x.to(device).type(torch.cuda.FloatTensor)) loss = loss_fn(x_out, y.long().to(device)) loss.backward() epoch_bar.set_description(f'loss:{loss.item():.4f}') optimizer.step() if epoch % 100 == 0 or epoch == epoch - 1: torch.save(lstm_model.state_dict(), "/content/drive/MyDrive/危急值/model/dangerous.pth") print("权重成功保存一次")

以下是加入 Test Loss 功能后的代码：

import torch
import torch.nn as nn
import torch.optim as optim
from torch.utils.data import DataLoader

class LSTM(nn.Module):
    def __init__(self, input_size, hidden_size, num_layers, output_size, batch_size, device):
        super().__init__()
        self.device = device
        self.input_size = input_size
        self.hidden_size = hidden_size
        self.num_layers = num_layers
        self.output_size = output_size
        self.num_directions = 1 # 单向LSTM
        self.batch_size = batch_size
        self.lstm = nn.LSTM(self.input_size, self.hidden_size, self.num_layers, batch_first=True)
        self.linear = nn.Linear(65536, self.output_size)

    def forward(self, input_seq):
        h_0 = torch.randn(self.num_directions * self.num_layers, self.batch_size, self.hidden_size).to(self.device)
        c_0 = torch.randn(self.num_directions * self.num_layers, self.batch_size, self.hidden_size).to(self.device)
        output, _ = self.lstm(input_seq, (h_0, c_0))
        pred = self.linear(output.contiguous().view(self.batch_size, -1))
        return pred

if __name__ == '__main__':
    # 加载已保存的模型参数
    saved_model_path = '/content/drive/MyDrive/危急值/model/dangerous.pth'
    device = 'cuda:0'
    lstm_model = LSTM(input_size=1, hidden_size=64, num_layers=1, output_size=3, batch_size=256, device=device).to(device)
    state_dict = torch.load(saved_model_path)
    lstm_model.load_state_dict(state_dict)
    
    # 加载测试数据集
    test_dataset = ECGDataset(X_test_df.to_numpy())
    test_loader = DataLoader(test_dataset, batch_size=256, shuffle=False, num_workers=0, drop_last=False)
    
    # 定义损失函数和优化器
    loss_fn = nn.CrossEntropyLoss()
    optimizer = optim.SGD(lstm_model.parameters(), lr=1e-4)
    
    # 开始训练
    for epoch in range(200000):
        print(f'epoch:{epoch}')
        lstm_model.train()
        epoch_bar = tqdm(dataloader)
        for x, y in epoch_bar:
            optimizer.zero_grad()
            x_out = lstm_model(x.to(device).type(torch.cuda.FloatTensor))
            loss = loss_fn(x_out, y.long().to(device))
            loss.backward()
            epoch_bar.set_description(f'loss:{loss.item():.4f}')
            optimizer.step()
        
        # 计算测试集上的平均损失
        test_loss = 0.0
        lstm_model.eval()
        with torch.no_grad():
            for x, y in test_loader:
                x_out = lstm_model(x.to(device).type(torch.cuda.FloatTensor))
                loss = loss_fn(x_out, y.long().to(device))
                test_loss += loss.item() * x.size(0)
        test_loss /= len(test_dataset)
        print(f'Test Loss: {test_loss:.4f}')
        
        if epoch % 100 == 0 or epoch == epoch - 1:
            torch.save(lstm_model.state_dict(), "/content/drive/MyDrive/危急值/model/dangerous.pth")
            print("权重成功保存一次")

在这个代码中，我们首先加载了测试数据集 `test_dataset` 和测试数据加载器 `test_loader`。在每个 epoch 完成后，我们计算测试集上的平均损失值。我们使用 `lstm_model.eval()` 将模型设为评估模式，并利用 `torch.no_grad()` 避免计算梯度，以加速计算。最后，我们输出测试集上的平均损失值。