print('Start training ...') flag = True for epoch in range(epochs): # print('MODE NOW: {}'.format(mode)) for train_images, train_labels in train_ds: train(train_images, train_labels, epoch, training_mode) if flag: bc_model.summary() flag = False for test_images, test_labels in test_ds: test(test_images, test_labels, training_mode) # save model if epoch % 10 == 0 and epoch > 0: print('Saving weights to {}'.format(output_dir)) bc_model.save_weights(os.path.join(output_dir, "bc_model_{}.ckpt".format(epoch))) with metrics_writer.as_default(): tf.summary.scalar('train_loss_rec_gate', train_loss_rec_v.result(), step=epoch) tf.summary.scalar('test_loss_rec_gate', test_loss_rec_v.result(), step=epoch) print('Epoch {} | Train L_gate: {} | Test L_gate: {}' .format(epoch, train_loss_rec_v.result(), test_loss_rec_v.result())) reset_metrics() # reset all the accumulators of metrics print('bla')

python torch.utils.data.DataLoader使用方法

for epoch in range(3): # 演示3个epochs for step, (batch_x, batch_y) in enumerate(loader): # 训练过程中的操作 print("step:{}, batch_x:{}, batch_y:{}".format(step, batch_x, batch_y)) if __name__ ==...

PyTorch练手项目分享：模型微调 .docx

for epoch in range(EPOCHS): running_loss = 0.0 for inputs, labels in dataloader: inputs, labels = inputs.to(DEVICE), labels.to(DEVICE) optimizer.zero_grad() outputs = model(inputs) loss = ...

# training model = CNNmodel() print(model) criterion = nn.MSELoss() optimizer = torch.optim.Adam(model.parameters(), lr=0.001) epochs = 350 model.train() for epoch in range(epochs): for seq, y_train in train_set: # The gradient is zeroed and initialized before each parameter update optimizer.zero_grad() # reshape # convert to conv1d input size（batch size, channel, series length） y_pred = model(seq.reshape(1,1,-1)) loss = criterion(y_pred, y_train) loss.backward() optimizer.step() print(f'Epoch: {epoch+1:2} Loss: {loss.item():10.8f}')报错cannot unpack non-iterable numpy.float64 object

for seq, y_train in train_set: 你可以检查一下train_set的数据类型，看看是否与你预期的一致。如果train_set是一个numpy array，你可以尝试使用numpy中的enumerate函数来遍历数据集： python for i, (seq...

# training model = CNNmodel() print(model) criterion = nn.MSELoss() optimizer = torch.optim.Adam(model.parameters(), lr=0.001) epochs = 50 model.train() start_time = time.time() for epoch in range(epochs): for seq, y_train in train_data: # The gradient is zeroed and initialized before each parameter update optimizer.zero_grad() # reshape # convert to conv1d input size（batch size, channel, series length） y_pred = model(seq.reshape(1,1,-1)) loss = criterion(y_pred, y_train) loss.backward() optimizer.step() print(f'Epoch: {epoch+1:2} Loss: {loss.item():10.8f}') print(f'\nDuration: {time.time() - start_time:.0f} seconds')报错name 'train_data' is not defined

train_data = DataLoader(dataset, batch_size=1, shuffle=True) 请注意，这里的dataset应该是你的训练数据集，batch_size是你要使用的批量大小，shuffle是指是否对数据进行洗牌。你需要根据你的数据集和实验...

for epoch in range(config.num_epochs): print('Epoch [{}/{}]'.format(epoch + 1, config.num_epochs)) for i, (trains, labels) in enumerate(train_iter): outputs = model(trains) model.zero_grad() loss = F.cross_entropy(outputs, labels) loss.backward() optimizer.step() if total_batch % 1 == 0: # 每多少轮输出在训练集和验证集上的效果 true = labels.data.cpu() predic = torch.max(outputs.data, 1)[1].cpu() train_acc = metrics.accuracy_score(true, predic) dev_acc, dev_loss = evaluate(config, model, dev_iter) if dev_loss < dev_best_loss: dev_best_loss = dev_loss torch.save(model.state_dict(), config.save_path) improve = '*' last_improve = total_batch else: improve = '' time_dif = get_time_dif(start_time) msg = 'Iter: {0:>6}, Train Loss: {1:>5.2}, Train Acc: {2:>6.2%}, Val Loss: {3:>5.2}, Val Acc: {4:>6.2%}, Time: {5} {6}' print(msg.format(total_batch, loss.item(), train_acc, dev_loss, dev_acc, time_dif, improve)) text = msg.format(total_batch, loss.item(), train_acc, dev_loss, dev_acc, time_dif, improve) with open(f"{config.model_name}_result.txt", mode="a+", encoding="utf8") as f: f.write(text + "\n") model.train() total_batch += 1 if (total_batch - last_improve > config.require_improvement) or total_batch == 188: # 验证集loss超过1000batch没下降，结束训练 print("No optimization for a long time, auto-stopping...") flag = True break if flag: break test(config, model, test_iter)

在循环过程中，total_batch的值会不断增加，flag标志位用于判断是否已经训练了很久但是效果没有提升，如果flag为True，则跳出循环，结束训练。最后调用了一个test函数，用于对测试集进行测试并输出结果。

解释代码： for epoch in range(epochs): model.train() flag = False # flag为true则本轮best_loss被更新 accumulate_train_loss, accumulate_test_loss = 0, 0

如果在本轮中损失值有所改进，flag会被设置为True。 3. accumulate_train_loss, accumulate_test_loss = 0, 0：这是两个累加变量，用于跟踪训练和测试损失值的累积值。它们初始值都为0。在每轮的后续步骤中，...

# This is a sample Python script. # Press Shift+F10 to execute it or replace it with your code. # Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings. import torch import torchvision from PIL.Image import Image from torch.utils.tensorboard import SummaryWriter from torch import nn, optim from torch.utils.data import dataloader from torchvision.transforms import transforms from module import MyModule train = torchvision.datasets.CIFAR10(root="../data",train=True, download=True, transform= transforms.ToTensor()) vgg_model = torchvision.models.vgg16(pretrained=True) vgg_model.classifier.add_module('add_linear', nn.Linear(1000,2)) #ToImage = transforms.ToPILImage() #Image.show(ToImage(train[0][0])) train_data = dataloader.DataLoader(train, batch_size = 128, shuffle=True) model = MyModule() epochs = 5 learningRate = 1e-3 optimizer = optim.SGD(model.parameters(),lr = learningRate) loss = nn.CrossEntropyLoss() Writer = SummaryWriter(log_dir="Training") step = 0 for epoch in range(epochs): total_loss = 0 for data,labels in train_data: y = vgg_model(data) los = loss(y,labels) optimizer.zero_grad() los.backward() optimizer.step() Writer.add_scalar("Training",los,step) step = step + 1 if step%100 == 0: print("Training for {0} times".format(step)) total_loss += los print("total_loss is {0}".format(los)) Writer.close() torch.save(vgg_model,"model_vgg.pth")将以上代码修改为二分类

for epoch in range(epochs): total_loss = 0 for data, labels in train_loader: optimizer.zero_grad() output = vgg_model(data) loss = loss_fn(output, labels) loss.backward() optimizer.step() ...

for epoch in range(num_epochs): # 更改num_epochs为你所需的轮数

for iteration in range(num_training_rounds): # 在这里编写你的训练步骤... 优化说明： - 添加了对 num_training_rounds 的注释，使其含义更清晰。 - 将 epoch 改为了 iteration，使得代码更容易理解...

EPOCHS = 10 # TODO：完成完整的训练过程 for epoch in range(EPOCHS): ...... # TODO：输出本周期所有批次训练(或测试)数据的平均loss和accuracy ......

for epoch in range(EPOCHS): # 训练或测试代码 # ... # 计算本周期所有批次训练（或测试）数据的平均 loss 和 accuracy epoch_loss = 0 epoch_acc = 0 num_batches = 0 for batch_data in dataset: # ...

import torch from torch import nn from torch.utils.tensorboard import SummaryWriter class MyModule(nn.Module): def init(self): super(MyModule, self).init() self.model1 = nn.Sequential( nn.Flatten(), nn.Linear(3072, 100), nn.ReLU(), nn.Linear(100, 1), nn.Sigmoid() ) def forward(self, x): x = self.model1(x) return x import torch import torchvision from PIL.Image import Image from torch.utils.tensorboard import SummaryWriter from torch import nn, optim from torch.utils.data import dataloader from torchvision.transforms import transforms from module import MyModule train = torchvision.datasets.CIFAR10(root="../data",train=True, download=True, transform= transforms.ToTensor()) vgg_model = torchvision.models.vgg16(pretrained=True) vgg_model.classifier.add_module('add_linear', nn.Linear(1000,2)) #ToImage = transforms.ToPILImage() #Image.show(ToImage(train[0][0])) train_data = dataloader.DataLoader(train, batch_size = 128, shuffle=True) model = MyModule() #criterion = nn.BCELoss() epochs = 5 learningRate = 1e-3 optimizer = optim.SGD(model.parameters(),lr = learningRate) loss = nn.CrossEntropyLoss() Writer = SummaryWriter(log_dir="Training") step = 0 for epoch in range(epochs): total_loss = 0 for data,labels in train_data: y = vgg_model(data) los = loss(y,labels) optimizer.zero_grad() los.backward() optimizer.step() Writer.add_scalar("Training",los,step) step = step + 1 if step%100 == 0: print("Training for {0} times".format(step)) total_loss += los print("total_loss is {0}".format(los)) Writer.close() torch.save(vgg_model,"model_vgg.pth")修改变成VGG16-两分类模型

for epoch in range(epochs): total_loss = 0 for data,labels in train_data: optimizer.zero_grad() y = vgg_model(data) los = criterion(y,labels) los.backward() optimizer.step() Writer....

train the model for 10 epochs num_epochs = 10 for epoch in range(num_epochs): # train for one epoch, printing every 10 iterations torchvision.models.detection.train_one_epoch(model, optimizer, data_loader, device=torch.device('cuda')) # update the learning rate lr_scheduler.step() # evaluate on the test dataset every epoch torchvision.models.detection.evaluate(model, data_loader, device=torch.device('cuda'))详细写出上述代码中的train_one_epoch和evaluate函数，给出代码注释

print(f"Epoch [{epoch+1}/{num_epochs}], Batch [{i}/{len(data_loader)}], Train Loss: {losses.item():.4f}") # 计算平均训练损失 train_loss /= len(data_loader) # 返回平均训练损失 return train_loss ...

dataset = CocoDetection(root=r'D:\file\study\data\COCO2017\train2017', annFile=r'D:\file\study\data\COCO2017\annotations\instances_train2017.json', transforms=transforms.Compose([transforms.ToTensor()])) # 定义训练集和测试集的比例 train_ratio = 0.8 test_ratio = 0.2 # 计算训练集和测试集的数据数量 num_data = len(dataset) num_train_data = int(num_data * train_ratio) num_test_data = num_data - num_train_data # 使用random_split函数将数据集划分为训练集和测试集 train_dataset, test_dataset = random_split(dataset, [num_train_data, num_test_data]) # 打印训练集和测试集的数据数量 print(f"Number of training data: {len(train_dataset)}") print(f"Number of test data: {len(test_dataset)}") train_loader = DataLoader(train_dataset, batch_size=8, shuffle=True, num_workers=0) test_loader = DataLoader(test_dataset, batch_size=8, shuffle=True, num_workers=0) # define the optimizer and the learning rate scheduler params = [p for p in model.parameters() if p.requires_grad] optimizer = torch.optim.SGD(params, lr=0.005, momentum=0.9, weight_decay=0.0005) lr_scheduler = torch.optim.lr_scheduler.StepLR(optimizer, step_size=3, gamma=0.1) # train the model for 10 epochs num_epochs = 10 for epoch in range(num_epochs): # 将模型设置为训练模式 model.train() # 初始化训练损失的累计值 train_loss = 0.0 # 构建一个迭代器，用于遍历数据集 for i, images, targets in train_loader: print(images) print(targets) # 将数据转移到设备上 images = list(image.to(device) for image in images) targets = [{k: v.to(device) for k, v in t.items()} for t in targets]上述代码报错：TypeError: call() takes 2 positional arguments but 3 were given

for i, (images, targets) in enumerate(train_loader): # do something with images and targets 这样，你就可以使用enumerate函数获取每个批次数据的索引，同时获取图像和目标。同时，如果你希望在训练...

def train(train_dataset, val_dataset, batch_size, epochs, learning_rate, wt_decay, print_cost=True, isPlot=True): # 加载数据集并分割batch train_loader = data.DataLoader(train_dataset, batch_size) # x = data.DataLoader(train_dataset) # x_train_label, y_train_label = train_test_split(x, test_size = 0.2, stratify=y, shuffle=True) # 构建模型 model = FaceCNN() # 加载模型 # model = torch.load('./model/model.pth') model.to(device) # 损失函数和优化器 compute_loss = nn.CrossEntropyLoss() optimizer = optim.SGD(model.parameters(), lr=learning_rate, weight_decay=wt_decay) # 学习率衰减 # scheduler = optim.lr_scheduler.StepLR(optimizer, step_size=10, gamma=0.8) for epoch in range(epochs): loss = 0 model.train() model = model.to(device) for images, labels in train_loader: optimizer.zero_grad() outputs = model.forward(images.to(device)) loss = compute_loss(outputs, labels.to(device)) loss.backward() optimizer.step() # 打印损失值 if print_cost: print('epoch{}: train_loss:'.format(epoch + 1), loss.item()) # 评估模型准确率 if epoch % 10 == 9: model.eval() acc_train = validate(model, train_dataset, batch_size) acc_val = validate(model, val_dataset, batch_size) print('acc_train: %.1f %%' % (acc_train * 100)) print('acc_val: %.1f %%' % (acc_val * 100)) return model

9. 打印损失值：如果 print_cost 参数为 True，在每个 epoch 完成后打印当前 epoch 的训练损失。 10. 评估模型准确率：如果当前 epoch 的索引是 9 的倍数，即每 10 个 epoch，使用验证集 val_dataset 对模型...

num_epochs = 3 for epoch in range(num_epochs): for X, y in data_iter: l = loss(net(X) ,y) trainer.zero_grad() l.backward() trainer.step() l = loss(net(features), labels) print(f'epoch {epoch + 1}, loss {l:f}')

在每个epoch中，通过data_iter迭代器遍历训练数据集，计算损失（l）并进行反向传播和参数更新。然后，计算并打印该epoch的损失值。在这段代码中，num_epochs定义了训练的总轮数。通过循环迭代num_epochs次，我们...

def train_step(real_ecg, dim): noise = tf.random.normal(dim) for i in range(disc_steps): with tf.GradientTape() as disc_tape: generated_ecg = generator(noise, training=True) real_output = discriminator(real_ecg, training=True) fake_output = discriminator(generated_ecg, training=True) disc_loss = discriminator_loss(real_output, fake_output) gradients_of_discriminator = disc_tape.gradient(disc_loss, discriminator.trainable_variables) discriminator_optimizer.apply_gradients(zip(gradients_of_discriminator, discriminator.trainable_variables)) ### for tensorboard ### disc_losses.update_state(disc_loss) fake_disc_accuracy.update_state(tf.zeros_like(fake_output), fake_output) real_disc_accuracy.update_state(tf.ones_like(real_output), real_output) ####################### with tf.GradientTape() as gen_tape: generated_ecg = generator(noise, training=True) fake_output = discriminator(generated_ecg, training=True) gen_loss = generator_loss(fake_output) gradients_of_generator = gen_tape.gradient(gen_loss, generator.trainable_variables) generator_optimizer.apply_gradients(zip(gradients_of_generator, generator.trainable_variables)) ### for tensorboard ### gen_losses.update_state(gen_loss) ####################### def train(dataset, epochs, dim): for epoch in tqdm(range(epochs)): for batch in dataset: train_step(batch, dim) disc_losses_list.append(disc_losses.result().numpy()) gen_losses_list.append(gen_losses.result().numpy()) fake_disc_accuracy_list.append(fake_disc_accuracy.result().numpy()) real_disc_accuracy_list.append(real_disc_accuracy.result().numpy()) ### for tensorboard ### # with disc_summary_writer.as_default(): # tf.summary.scalar('loss', disc_losses.result(), step=epoch) # tf.summary.scalar('fake_accuracy', fake_disc_accuracy.result(), step=epoch) # tf.summary.scalar('real_accuracy', real_disc_accuracy.result(), step=epoch) # with gen_summary_writer.as_default(): # tf.summary.scalar('loss', gen_losses.result(), step=epoch) disc_losses.reset_states() gen_losses.reset_states() fake_disc_accuracy.reset_states() real_disc_accuracy.reset_states() ####################### # Save the model every 5 epochs # if (epoch + 1) % 5 == 0: # generate_and_save_ecg(generator, epochs, seed, False) # checkpoint.save(file_prefix = checkpoint_prefix) # Generate after the final epoch display.clear_output(wait=True) generate_and_save_ecg(generator, epochs, seed, False)

接着train函数定义了整个训练过程，包括了epochs个epoch的训练，每个epoch通过遍历dataset中的batch进行训练。在训练过程中，每个batch都会调用train_step函数进行训练，并记录loss和accuracy等信息。最后，每隔一定...

描述这段代码 #定义训练网络函数，网络，损失评价，训练集 def train(net, trainloader, criterion, optimizer, num_epochs, device, num_print, lr_scheduler=None, testloader=None): net.train() record_train = list() record_test = list() for epoch in range(num_epochs): print("========== epoch: [{}/{}] ==========".format(epoch + 1, num_epochs)) total, correct, train_loss = 0, 0, 0 start = time.time() for i, (X, y) in enumerate(trainloader): X, y = X.to(device), y.to(device) output = net(X) loss = criterion(output, y) optimizer.zero_grad() loss.backward() optimizer.step() train_loss += loss.item() total += y.size(0) correct += (output.argmax(dim=1) == y).sum().item() train_acc = 100.0 * correct / total if (i + 1) % num_print == 0: print("step: [{}/{}], train_loss: {:.3f} | train_acc: {:6.3f}% | lr: {:.6f}" \ .format(i + 1, len(trainloader), train_loss / (i + 1), \ train_acc, get_cur_lr(optimizer))) if lr_scheduler is not None: lr_scheduler.step() print("--- cost time: {:.4f}s ---".format(time.time() - start)) if testloader is not None: record_test.append(test(net, testloader, criterion, device)) record_train.append(train_acc) return record_train, record_test def get_cur_lr(optimizer): for param_group in optimizer.param_groups: return param_group['lr'] #定义保存网络参数的函数 def save(net,path): torch.save(net.state_dict(), path)

同时，统计每个batch的训练准确率和损失值，以及整个epoch的训练准确率，并在每个num_print步输出一次。如果设置了学习率调整器lr_scheduler，则在每个epoch结束后调用lr_scheduler.step()函数对学习率进行调整。...

train with base lr in the first 100 epochs # and half the lr in the last 100 epochs To train with a base learning rate for the first 100 epochs and half the learning rate for the last 100 epochs, you can use a learning rate scheduler in PyTorch. Here's an example of how you can modify the training loop in your code: import torch import torch.nn as nn import torch.optim as optim from torch.optim.lr_scheduler import MultiStepLR # Define your model, criterion, and optimizer model = YourModel() criterion = nn.CrossEntropyLoss() optimizer = optim.SGD(model.parameters(), lr=0.01) # Define the number of epochs and the milestone epochs num_epochs = 200 milestones = [100] # Create a learning rate scheduler scheduler = MultiStepLR(optimizer, milestones=milestones, gamma=0.5) # Train the model for epoch in range(num_epochs): # Train with base lr for the first 100 epochs, and half the lr for the last 100 epochs if epoch >= milestones[0]: scheduler.step() for inputs, labels in train_loader: # Forward pass outputs = model(inputs) loss = criterion(outputs, labels) # Backward pass and optimization optimizer.zero_grad() loss.backward() optimizer.step() # Perform validation or testing after each epoch with torch.no_grad(): # Validation or testing code # Print training information print(f"Epoch [{epoch+1}/{num_epochs}], Loss: {loss.item()}, LR: {scheduler.get_last_lr()[0]}") # Save the model or perform other operations after training In this code snippet, we create a MultiStepLR scheduler and specify the milestones as [100] and gamma as 0.5. The learning rate is halved at the specified milestone epochs. Inside the training loop, we check if the current epoch is greater than or equal to the milestone epoch, and if so, we call scheduler.step() to update the learning rate. Remember to adjust the num_epochs and other hyperparameters according to your specific requirements. 翻译成中文

for epoch in range(num_epochs): # 在前100个epochs中使用基本学习率，最后100个epochs将学习率减半 if epoch >= milestones[0]: scheduler.step() for inputs, labels in train_loader: # 前向传播 outputs...

def train(generator, discriminator, gan, X_train, latent_dim, epochs=90, batch_size=70, loss_d=None, loss_g=None): for epoch in range(epochs): # 生成随机噪声 noise = np.random.normal(0, 1, size=(batch_size, latent_dim)) # 生成器生成假数据 fake_X = generator.predict(noise) # 随机选择真实数据 idx = np.random.randint(0, X_train.shape[0], batch_size) real_X = X_train[idx] # 训练判别器 discriminator.trainable = True discriminator.train_on_batch(real_X, np.ones((batch_size, 1))) discriminator.train_on_batch(fake_X, np.zeros((batch_size, 1))) # 训练生成器 discriminator.trainable = False gan.train_on_batch(noise, np.ones((batch_size, 1))) # 每 10 个 epoch 打印一次损失 if epoch % 10 == 0: print('Epoch %d: loss_d=%.4f, loss_g=%.4f' % (epoch, loss_d, loss_g))

这段代码是一个简单的 GAN（生成对抗网络）的训练过程，包括生成器、判别器和整个 GAN 的训练。其中，生成器用随机噪声生成假数据，判别器用于判别真实数据和假数据的真伪，并对两种...每 10 个 epoch 打印一次损失。

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解释代码： for epoch in range(epochs): model.train() flag = False # flag为true则本轮best_loss被更新 accumulate_train_loss, accumulate_test_loss = 0, 0

for epoch in range(num_epochs): # 更改num_epochs为你所需的轮数

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