为以下代码添加注释def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation loss.backward() optimizer.step() optimizer.zero_grad() if batch % 100 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]")

时间: 2023-06-25 12:07:56 浏览: 51
# 定义模型训练函数 def train(dataloader, model, loss_fn, optimizer): # 获取数据集大小 size = len(dataloader.dataset) # 将模型设置为训练模式 model.train() # 遍历数据集中的每个批次 for batch, (X, y) in enumerate(dataloader): # 将数据移动到GPU上 X, y = X.to(device), y.to(device) # 计算预测误差 pred = model(X) loss = loss_fn(pred, y) # 反向传播 loss.backward() optimizer.step() optimizer.zero_grad() # 打印每100批次的损失值 if batch % 100 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]")
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def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() LossList = [] for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) y=y.long() # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation optimizer.zero_grad() loss.backward() optimizer.step() if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") LossList.append(loss) return Losslist def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() LossList = [] AccList = [] test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) y=y.long() pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size LossList.append(test_loss) AccList.append(correct) print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n") return LossList,acclist报错显示lostlist未定义

在这段代码中,`losslist` 和 `acclist` 都没有被定义。你需要在函数内部定义这两个变量,或者在函数调用前将它们定义并且传入函数。例如,你可以在函数内部这样定义它们: ``` def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() losslist = [] # 在这里定义 losslist for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) y = y.long() # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation optimizer.zero_grad() loss.backward() optimizer.step() if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") losslist.append(loss) # 将 loss 添加到 losslist 中 return losslist def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() losslist = [] # 在这里定义 losslist acclist = [] # 在这里定义 acclist test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) y = y.long() pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size losslist.append(test_loss) # 将 test_loss 添加到 losslist 中 acclist.append(correct) # 将 correct 添加到 acclist 中 print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n") return losslist, acclist ```

def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) model.train() for batch, (X, y) in enumerate(dataloader): X, y = X.to(device), y.to(device) y=y.long() # Compute prediction error pred = model(X) loss = loss_fn(pred, y) # Backpropagation optimizer.zero_grad() loss.backward() optimizer.step() if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") return Losslist def test(dataloader, model, loss_fn): size = len(dataloader.dataset) num_batches = len(dataloader) model.eval() test_loss, correct = 0, 0 with torch.no_grad(): for X, y in dataloader: X, y = X.to(device), y.to(device) y=y.long() pred = model(X) test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size print(f"Test Error: \n Accuracy: {(100*correct):>0.1f}%, Avg loss: {test_loss:>8f} \n") return LossList,acclist如何修改

如果你想要在这段代码中记录每个 epoch 的损失和准确率,你需要做以下修改: 1. 在 train 和 test 函数中定义 LossList 和 AccList 两个列表,用于记录每个 epoch 的损失和准确率。可以在函数开始时定义它们,比如: ``` def train(dataloader, model, loss_fn, optimizer): LossList = [] ... def test(dataloader, model, loss_fn): LossList = [] AccList = [] ... ``` 2. 在 train 循环中,每 50 个 batch 输出当前的损失和已经处理的样本数量的同时,将损失添加到 LossList 中,比如: ``` if batch % 50 == 0: loss, current = loss.item(), (batch + 1) * len(X) print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") LossList.append(loss) ``` 3. 在 test 循环中,将每个 batch 的损失和准确率记录到对应的列表中,比如: ``` for X, y in dataloader: ... test_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() test_loss /= num_batches correct /= size LossList.append(test_loss) AccList.append(correct) ``` 4. 最后,在 train 和 test 函数的返回值中添加 LossList 和 AccList,以便在之后的分析和可视化中使用,比如: ``` return LossList ... return LossList, AccList ``` 这些修改会让 train 和 test 函数记录每个 epoch 的损失和准确率,并将它们存储在 LossList 和 AccList 中。你可以在每个 epoch 结束时保存这些列表,然后使用它们进行可视化或其他分析。

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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")

def train(model, train_loader, criterion, optimizer): model.train() train_loss = 0.0 train_acc = 0.0 for i, (inputs, labels) in enumerate(train_loader): optimizer.zero_grad() outputs = model(inputs.unsqueeze(1).float()) loss = criterion(outputs, labels.long()) loss.backward() optimizer.step() train_loss += loss.item() * inputs.size(0) _, preds = torch.max(outputs, 1) train_acc += torch.sum(preds == labels.data) train_loss = train_loss / len(train_loader.dataset) train_acc = train_acc.double() / len(train_loader.dataset) return train_loss, train_acc def test(model, verify_loader, criterion): model.eval() test_loss = 0.0 test_acc = 0.0 with torch.no_grad(): for i, (inputs, labels) in enumerate(test_loader): outputs = model(inputs.unsqueeze(1).float()) loss = criterion(outputs, labels.long()) test_loss += loss.item() * inputs.size(0) _, preds = torch.max(outputs, 1) test_acc += torch.sum(preds == labels.data) test_loss = test_loss / len(test_loader.dataset) test_acc = test_acc.double() / len(test_loader.dataset) return test_loss, test_acc # Instantiate the model model = CNN() # Define the loss function and optimizer criterion = nn.CrossEntropyLoss() optimizer = optim.Adam(model.parameters(), lr=0.001) # Instantiate the data loaders train_dataset = MyDataset1('1MATRICE') train_loader = DataLoader(train_dataset, batch_size=5, shuffle=True) test_dataset = MyDataset2('2MATRICE') test_loader = DataLoader(test_dataset, batch_size=5, shuffle=False) train_losses, train_accs, test_losses, test_accs = [], [], [], [] for epoch in range(500): train_loss, train_acc = train(model, train_loader, criterion, optimizer) test_loss, test_acc = test(model, test_loader, criterion) train_losses.append(train_loss) train_accs.append(train_acc) test_losses.append(test_loss) test_accs.append(test_acc) print('Epoch: {} Train Loss: {:.4f} Train Acc: {:.4f} Test Loss: {:.4f} Test Acc: {:.4f}'.format( epoch, train_loss, train_acc, test_loss, test_acc))

import numpy import numpy as np import matplotlib.pyplot as plt import math import torch from torch import nn from torch.utils.data import DataLoader, Dataset import os os.environ['KMP_DUPLICATE_LIB_OK']='True' dataset = [] for data in np.arange(0, 3, .01): data = math.sin(data * math.pi) dataset.append(data) dataset = np.array(dataset) dataset = dataset.astype('float32') max_value = np.max(dataset) min_value = np.min(dataset) scalar = max_value - min_value print(scalar) dataset = list(map(lambda x: x / scalar, dataset)) def create_dataset(dataset, look_back=3): dataX, dataY = [], [] for i in range(len(dataset) - look_back): a = dataset[i:(i + look_back)] dataX.append(a) dataY.append(dataset[i + look_back]) return np.array(dataX), np.array(dataY) data_X, data_Y = create_dataset(dataset) train_X, train_Y = data_X[:int(0.8 * len(data_X))], data_Y[:int(0.8 * len(data_Y))] test_X, test_Y = data_Y[int(0.8 * len(data_X)):], data_Y[int(0.8 * len(data_Y)):] train_X = train_X.reshape(-1, 1, 3).astype('float32') train_Y = train_Y.reshape(-1, 1, 3).astype('float32') test_X = test_X.reshape(-1, 1, 3).astype('float32') train_X = torch.from_numpy(train_X) train_Y = torch.from_numpy(train_Y) test_X = torch.from_numpy(test_X) class RNN(nn.Module): def __init__(self, input_size, hidden_size, output_size=1, num_layer=2): super(RNN, self).__init__() self.input_size = input_size self.hidden_size = hidden_size self.output_size = output_size self.num_layer = num_layer self.rnn = nn.RNN(input_size, hidden_size, batch_first=True) self.linear = nn.Linear(hidden_size, output_size) def forward(self, x): out, h = self.rnn(x) out = self.linear(out[0]) return out net = RNN(3, 20) criterion = nn.MSELoss(reduction='mean') optimizer = torch.optim.Adam(net.parameters(), lr=1e-2) train_loss = [] test_loss = [] for e in range(1000): pred = net(train_X) loss = criterion(pred, train_Y) optimizer.zero_grad() # 反向传播 loss.backward() optimizer.step() if (e + 1) % 100 == 0: print('Epoch:{},loss:{:.10f}'.format(e + 1, loss.data.item())) train_loss.append(loss.item()) plt.plot(train_loss, label='train_loss') plt.legend() plt.show()请适当修改代码,并写出预测值和真实值的代码

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')

LDAM损失函数pytorch代码如下:class LDAMLoss(nn.Module): def init(self, cls_num_list, max_m=0.5, weight=None, s=30): super(LDAMLoss, self).init() m_list = 1.0 / np.sqrt(np.sqrt(cls_num_list)) m_list = m_list * (max_m / np.max(m_list)) m_list = torch.cuda.FloatTensor(m_list) self.m_list = m_list assert s > 0 self.s = s if weight is not None: weight = torch.FloatTensor(weight).cuda() self.weight = weight self.cls_num_list = cls_num_list def forward(self, x, target): index = torch.zeros_like(x, dtype=torch.uint8) index_float = index.type(torch.cuda.FloatTensor) batch_m = torch.matmul(self.m_list[None, :], index_float.transpose(1,0)) # 0,1 batch_m = batch_m.view((16, 1)) # size=(batch_size, 1) (-1,1) x_m = x - batch_m output = torch.where(index, x_m, x) if self.weight is not None: output = output * self.weight[None, :] target = torch.flatten(target) # 将 target 转换成 1D Tensor logit = output * self.s return F.cross_entropy(logit, target, weight=self.weight) 模型部分参数如下:# 设置全局参数 model_lr = 1e-5 BATCH_SIZE = 16 EPOCHS = 50 DEVICE = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu') use_amp = True use_dp = True classes = 7 resume = None CLIP_GRAD = 5.0 Best_ACC = 0 #记录最高得分 use_ema=True model_ema_decay=0.9998 start_epoch=1 seed=1 seed_everything(seed) # 数据增强 mixup mixup_fn = Mixup( mixup_alpha=0.8, cutmix_alpha=1.0, cutmix_minmax=None, prob=0.1, switch_prob=0.5, mode='batch', label_smoothing=0.1, num_classes=classes) # 读取数据集 dataset_train = datasets.ImageFolder('/home/adminis/hpy/ConvNextV2_Demo/RAF-DB/RAF/train', transform=transform) dataset_test = datasets.ImageFolder("/home/adminis/hpy/ConvNextV2_Demo/RAF-DB/RAF/valid", transform=transform_test)# 导入数据 train_loader = torch.utils.data.DataLoader(dataset_train, batch_size=BATCH_SIZE, shuffle=True,drop_last=True) test_loader = torch.utils.data.DataLoader(dataset_test, batch_size=BATCH_SIZE, shuffle=False) 帮我用pytorch实现模型在模型训练中使用LDAM损失函数

帮我把这段代码从tensorflow框架改成pytorch框架: import tensorflow as tf import os import numpy as np import matplotlib.pyplot as plt os.environ["CUDA_VISIBLE_DEVICES"] = "0" base_dir = 'E:/direction/datasetsall/' train_dir = os.path.join(base_dir, 'train_img/') validation_dir = os.path.join(base_dir, 'val_img/') train_cats_dir = os.path.join(train_dir, 'down') train_dogs_dir = os.path.join(train_dir, 'up') validation_cats_dir = os.path.join(validation_dir, 'down') validation_dogs_dir = os.path.join(validation_dir, 'up') batch_size = 64 epochs = 50 IMG_HEIGHT = 128 IMG_WIDTH = 128 num_cats_tr = len(os.listdir(train_cats_dir)) num_dogs_tr = len(os.listdir(train_dogs_dir)) num_cats_val = len(os.listdir(validation_cats_dir)) num_dogs_val = len(os.listdir(validation_dogs_dir)) total_train = num_cats_tr + num_dogs_tr total_val = num_cats_val + num_dogs_val train_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) validation_image_generator = tf.keras.preprocessing.image.ImageDataGenerator(rescale=1. / 255) train_data_gen = train_image_generator.flow_from_directory(batch_size=batch_size, directory=train_dir, shuffle=True, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') val_data_gen = validation_image_generator.flow_from_directory(batch_size=batch_size, directory=validation_dir, target_size=(IMG_HEIGHT, IMG_WIDTH), class_mode='categorical') sample_training_images, _ = next(train_data_gen) model = tf.keras.models.Sequential([ tf.keras.layers.Conv2D(16, 3, padding='same', activation='relu', input_shape=(IMG_HEIGHT, IMG_WIDTH, 3)), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(32, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Conv2D(64, 3, padding='same', activation='relu'), tf.keras.layers.MaxPooling2D(), tf.keras.layers.Flatten(), tf.keras.layers.Dense(256, activation='relu'), tf.keras.layers.Dense(2, activation='softmax') ]) model.compile(optimizer='adam', loss=tf.keras.losses.BinaryCrossentropy(from_logits=True), metrics=['accuracy']) model.summary() history = model.fit_generator( train_data_gen, steps_per_epoch=total_train // batch_size, epochs=epochs, validation_data=val_data_gen, validation_steps=total_val // batch_size ) # 可视化训练结果 acc = history.history['accuracy'] val_acc = history.history['val_accuracy'] loss = history.history['loss'] val_loss = history.history['val_loss'] epochs_range = range(epochs) model.save("./model/timo_classification_128_maxPool2D_dense256.h5")

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))

import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader, Dataset class ConvNet(nn.Module): def __init__(self): super(ConvNet, self).__init__() self.conv1 = nn.Conv2d(in_channels=1, out_channels=32, kernel_size=3, stride=1, padding=1) self.relu = nn.ReLU() self.pool = nn.MaxPool2d(kernel_size=2, stride=2) self.fc1 = nn.Linear(32 * 14 * 14, 128) self.fc2 = nn.Linear(128, 10) def forward(self, x): x = self.conv1(x) x = self.relu(x) x = self.pool(x) x = x.view(-1, 32 * 14 * 14) x = self.fc1(x) x = self.relu(x) x = self.fc2(x) return x class MyDataset(Dataset): def __init__(self, data, target): self.data = data self.target = target def __getitem__(self, index): x = self.data[index] y = self.target[index] return x, y def __len__(self): return len(self.data) # 定义一些超参数 batch_size = 32 learning_rate = 0.001 epochs = 10 # 加载数据集 train_data = torch.randn(1000, 1, 28, 28) print(train_data) train_target = torch.randint(0, 10, (1000,)) print(train_target) train_dataset = MyDataset(train_data, train_target) train_loader = DataLoader(train_dataset, batch_size=batch_size, shuffle=True) # 构建模型 model = ConvNet() # 定义损失函数和优化器 criterion = nn.CrossEntropyLoss() optimizer = optim.Adam(model.parameters(), lr=learning_rate) # 训练模型 for epoch in range(epochs): for batch_idx, (data, target) in enumerate(train_loader): optimizer.zero_grad() output = model(data) loss = criterion(output, target) loss.backward() optimizer.step() if batch_idx % 10 == 0: print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format( epoch, batch_idx * len(data), len(train_loader.dataset), 100. * batch_idx / len(train_loader), loss.item())) # 保存模型 # torch.save(model.state_dict(), 'convnet.pth')

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