#@save def train_batch_ch13(net, X, y, loss, trainer, devices): """用多GPU进行小批量训练""" if isinstance(X, list): # 微调BERT中所需 X = [x.to(devices[0]) for x in X] else: X = X.to(devices[0]) y = y.to(devices[0]) net.train() trainer.zero_grad() pred = net(X) l = loss(pred, y) l.sum().backward() trainer.step() train_loss_sum = l.sum() train_acc_sum = d2l.accuracy(pred, y) return train_loss_sum, train_acc_sum #@save def train_ch13(net, train_iter, test_iter, loss, trainer, num_epochs, devices=d2l.try_all_gpus()): """用多GPU进行模型训练""" timer, num_batches = d2l.Timer(), len(train_iter) animator = d2l.Animator(xlabel='epoch', xlim=[1, num_epochs], ylim=[0, 1], legend=['train loss', 'train acc', 'test acc']) net = nn.DataParallel(net, device_ids=devices).to(devices[0]) for epoch in range(num_epochs): # 4个维度：储存训练损失，训练准确度，实例数，特点数 metric = d2l.Accumulator(4) for i, (features, labels) in enumerate(train_iter): timer.start() l, acc = train_batch_ch13( net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0], labels.numel()) timer.stop() if (i + 1) % (num_batches // 5) == 0 or i == num_batches - 1: animator.add(epoch + (i + 1) / num_batches, (metric[0] / metric[2], metric[1] / metric[3], None)) test_acc = d2l.evaluate_accuracy_gpu(net, test_iter) animator.add(epoch + 1, (None, None, test_acc)) print(f'loss {metric[0] / metric[2]:.3f}, train acc ' f'{metric[1] / metric[3]:.3f}, test acc {test_acc:.3f}') print(f'{metric[2] * num_epochs / timer.sum():.1f} examples/sec on ' f'{str(devices)}')

tensorflow_Resnet_train_test:用于在自己的数据集上训练不同体系结构（DenseNet，ResNet，AlexNet，GoogLeNet，VGG，NiN）的代码+多GPU支持+批处理和单个图像测试支持

tensorflow_Resnet_train_test 用于在自己的数据集上训练不同体系结构（DenseNet，ResNet，AlexNet，GoogLeNet，VGG，NiN）的代码+多GPU支持+批处理和单个图像测试支持该存储库提供了一种易于使用的方法，用于在您自己的数据集上训练和测试不同的知名深度学习架构。该代码直接从磁盘加载图像。此外，还支持多GPU和传输学习，您也可以选择批量或单次测试图像。基于存储库：＃用法示例：训练：准备训练数据列表：python train_val_datalist_creater.py 培训或转移学习：python train.py 测试： python eval.py 或分批测试：准备测试数据清单： python train_val_datalist_creater.py --create_data val 批量

使用多GPU训练模型.md

使用多GPU训练模型.md

Bert_train_myself:自己对Bert训练原始码的改编，主要是为了方便随时获得验证集的LOSS值

Bert_train_myself 自己对Bert训练原始码的改编，主要是为了方便随时获得验证集的LOSS值

class process: def init(self, model=1): self.model = model def train_one_epoch(self, data_loader, net, loss_func, optimizer): net.train() floss = 0 for i, (x_batch, y_batch) in enumerate(data_loader()): out = net(x_batch) loss = loss_func(out, y_batch) # avloss = paddle.mean(loss) floss = floss + loss # _, pred = paddle.max(out, 1) # pred_train.extend(pred.data.tolist()) # act_train.extend(y_batch.data.tolist()) #tolist() 返回列表或者数字 optimizer.clear_grad() loss.backward() optimizer.step() # floss = floss/i+1 return floss解释一下

这段代码定义了一个名为 "process" 的类，其中包含了一个初始化函数 "__init__" 和一个训练一个 epoch 的函数 "train_one_epoch"。 __init__ 函数有一个默认参数 "model"，用于初始化类中的成员变量 "self.model"。...

def train(net, train_iter, val_iter, num_epochs, lr, wd, devices, lr_period, lr_decay): global val_acc, metric trainer = torch.optim.SGD(net.parameters(), lr=lr, momentum=0.9, weight_decay=wd) scheduler = torch.optim.lr_scheduler.StepLR(trainer, lr_period, lr_decay) num_batches, timer = len(train_iter), d2l.Timer() train_loss, train_accs, val_accs = [], [], [] for epoch in range(num_epochs): net.train() metric = d2l.Accumulator(3) for i, (features, labels) in enumerate(train_iter): trainer.zero_grad() features, labels = features.to(devices[0]), labels.to(devices[0]) l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0]) train_loss.append(metric[0] / metric[2]) train_accs.append(metric[1] / metric[2]) if val_iter is not None: val_acc = d2l.evaluate_accuracy_gpu(net, val_iter) val_accs.append(val_acc) d2l.plot(range(1, epoch + 2), [train_loss, train_accs, val_accs], xlabel='epoch', legend=['train loss', 'train acc', 'val acc'], figsize=(8, 6)) scheduler.step() TypeError: 'torch.device' object is not subscriptable

这个错误通常是由于在 for 循环中使用了一个不是列表或元组类型的对象进行索引操作，而这个对象又是一个 torch.device 类型的对象。具体来说，在下面这行代码中，devices 参数传递进来的可能不是一个列表或...

l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) RuntimeError: Input type (torch.cuda.FloatTensor) and weight type (torch.FloatTensor) should be the same

这个错误通常是由于模型和输入数据在 GPU 上运行时的数据类型不匹配导致的。可能的解决方法是将输入数据转换为与模型期望的相同的数据类型。如果模型期望的数据类型是 torch.cuda.FloatTensor，则需要将输入数据...

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')

这段代码是一个简单的卷积神经网络(ConvNet)在MNIST数据集上进行训练的代码。代码中定义了一个ConvNet类，它包含一个卷积层、ReLU激活函数、池化层和两个全连接层。同时，代码还定义了一个MyDataset类来加载数据集，...

# 训练 def train_crack_captcha_cnn(): output = crack_captcha_cnn() # loss #loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(logits=output, labels=Y)) loss = tf.reduce_mean(tf.nn.sigmoid_cross_entropy_with_logits(logits=output, labels=Y)) # 最后一层用来分类的softmax和sigmoid有什么不同？ # optimizer 为了加快训练 learning_rate应该开始大，然后慢慢衰 optimizer = tf.train.AdamOptimizer(learning_rate=0.002).minimize(loss) predict = tf.reshape(output, [-1, MAX_CAPTCHA, CHAR_SET_LEN]) max_idx_p = tf.argmax(predict, 2) max_idx_l = tf.argmax(tf.reshape(Y, [-1, MAX_CAPTCHA, CHAR_SET_LEN]), 2) correct_pred = tf.equal(max_idx_p, max_idx_l) accuracy = tf.reduce_mean(tf.cast(correct_pred, tf.float32)) saver = tf.train.Saver() with tf.Session() as sess: sess.run(tf.global_variables_initializer()) step = 0 while True: batch_x, batch_y = get_next_batch(64) _, loss_ = sess.run([optimizer, loss], feed_dict={X: batch_x, Y: batch_y, keep_prob: 0.75, train_phase:True}) print(step, loss_) # 每100 step计算一次准确率 if step % 100 == 0 and step != 0: batch_x_test, batch_y_test = get_next_batch(100) acc = sess.run(accuracy, feed_dict={X: batch_x_test, Y: batch_y_test, keep_prob: 1., train_phase:False}) print(f"第{step}步，训练准确率为：{acc:.4f}") # 如果准确率大60%,保存模型,完成训练 if acc > 0.6: saver.save(sess, "crack_capcha.model", global_step=step) break step += 1 怎么没有输出结果

其中，loss 函数使用的是 sigmoid_cross_entropy_with_logits，这是因为验证码每个字符只有一个正确的标签，而不是像分类问题那样多个标签，所以使用 sigmoid 函数更为合适。softmax 函数主要应用在多分类问题中。在...

def train(net, train_iter, val_iter, num_epochs, lr, wd, devices, lr_period, lr_decay): global val_acc, metric net.to(devices[0]) trainer = torch.optim.SGD(net.parameters(), lr=lr, momentum=0.9, weight_decay=wd) scheduler = torch.optim.lr_scheduler.StepLR(trainer, lr_period, lr_decay) num_batches, timer = len(train_iter), d2l.Timer() train_loss, train_accs, val_accs = [], [], [] for epoch in range(num_epochs): net.train() metric = d2l.Accumulator(3) for i, (features, labels) in enumerate(train_iter): trainer.zero_grad() features, labels = features.to(devices[0]), labels.to(devices[0]) l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0]) train_loss.append(metric[0] / metric[2]) train_accs.append(metric[1] / metric[2]) if val_iter is not None: val_acc = d2l.evaluate_accuracy_gpu(net, val_iter) val_accs.append(val_acc) d2l.plot(range(1, epoch + 2), [train_loss, train_accs, val_accs], xlabel='epoch', legend=['train loss', 'train acc', 'val acc'], figsize=(8, 6)) scheduler.step() measures = (f'train loss {metric[0] / metric[2]:.3f},'f'train acc {metric[1] / metric[2]:.3f}') if val_iter is not None: measures += f', val acc {val_acc :.3f}' print(measures + f'\n {metric[2] * num_epochs / timer.sum() :.1f}' f'examples /sec on {str(devices)}')以上代码可以在pycharm中帮我实现画图功能吗？请优化代码

l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0]) train_loss.append(metric[0] / metric[2]) train_accs.append(metric[1] / metric[2]) ...

def train(net, train_iter, val_iter, num_epochs, lr, wd, devices, lr_period, lr_decay): global val_acc, metric net.to(devices[0]) trainer = torch.optim.SGD(net.parameters(), lr=lr, momentum=0.9, weight_decay=wd) scheduler = torch.optim.lr_scheduler.StepLR(trainer, lr_period, lr_decay) num_batches, timer = len(train_iter), d2l.Timer() train_loss, train_accs, val_accs = [], [], [] fig, ax = plt.subplots(figsize=(8, 6)) for epoch in range(num_epochs): net.train() metric = d2l.Accumulator(3) for i, (features, labels) in enumerate(train_iter): trainer.zero_grad() features, labels = features.to(devices[0]), labels.to(devices[0]) l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0]) train_loss.append(metric[0] / metric[2]) train_accs.append(metric[1] / metric[2]) if val_iter is not None: val_acc = d2l.evaluate_accuracy_gpu(net, val_iter) val_accs.append(val_acc) ax.plot(range(1, epoch + 2), [train_loss, train_accs, val_accs]) ax.set_xlabel('epoch') ax.set_ylabel('value') ax.legend(['train loss', 'train acc', 'val acc']) plt.show() scheduler.step() measures = ( f'train loss {metric[0] / metric[2]:.3f},'f'train acc {metric[1] / metric[2]:.3f}') if val_iter is not None: measures += f', val acc {val_acc :.3f}' print(以上代码能否实现时事图像展示？请优化成不等epoch结束就时事显示图像的代码

l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) metric.add(l, acc, labels.shape[0]) if (i + 1) % 100 == 0: # 每训练 100 个 batch，实时显示图像 train_loss.append(metric...

def get_data(index_dict,word_vectors,combined,y): n_symbols = len(index_dict) + 1 # 所有单词的索引数，频数小于10的词语索引为0，所以加1 embedding_weights = np.zeros((n_symbols, vocab_dim)) # 初始化索引为0的词语，词向量全为0 for word, index in index_dict.items(): # 从索引为1的词语开始，对每个词语对应其词向量 embedding_weights[index, :] = word_vectors[word] x_train, x_test, y_train, y_test = train_test_split(combined, y, test_size=0.2) y_train = keras.utils.to_categorical(y_train,num_classes=3) y_test = keras.utils.to_categorical(y_test,num_classes=3) # print x_train.shape,y_train.shape return n_symbols,embedding_weights,x_train,y_train,x_test,y_test ##定义网络结构 def train_lstm(n_symbols,embedding_weights,x_train,y_train,x_test,y_test): print 'Defining a Simple Keras Model...' model = Sequential() # or Graph or whatever model.add(Embedding(output_dim=vocab_dim, input_dim=n_symbols, mask_zero=True, weights=[embedding_weights], input_length=input_length)) # Adding Input Length model.add(LSTM(output_dim=50, activation='tanh')) model.add(Dropout(0.5)) model.add(Dense(3, activation='softmax')) # Dense=>全连接层,输出维度=3 model.add(Activation('softmax')) print 'Compiling the Model...' model.compile(loss='categorical_crossentropy', optimizer='adam',metrics=['accuracy']) print "Train..." # batch_size=32 model.fit(x_train, y_train, batch_size=batch_size, epochs=n_epoch,verbose=1) print "Evaluate..." score = model.evaluate(x_test, y_test, batch_size=batch_size) yaml_string = model.to_yaml() with open('../model/lstm.yml', 'w') as outfile: outfile.write( yaml.dump(yaml_string, default_flow_style=True) ) model.save_weights('../model/lstm.h5') print 'Test score:', score

这段代码是用于训练一个简单的Keras模型，实现情感分析任务的。可以看出，该模型包括了嵌入层、LSTM层、Dropout层和全连接层。其中，嵌入层用于将单词转换为向量表示，LSTM层用于处理序列数据，Dropout层用于防止过...

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

1. 加载数据集并分割 batch：使用 DataLoader 将训练数据集 train_dataset 加载，并按照指定的 batch_size 进行分割，得到一个数据加载器 train_loader。 2. 构建模型：创建一个人脸表情识别模型 FaceCNN...

def train(dataloader, model, loss_fn, optimizer): size = len(dataloader.dataset) num_batches = len(dataloader) model.train() train_loss, correct = 0, 0 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 optimizer.zero_grad() loss.backward() optimizer.step() train_loss += loss_fn(pred, y).item() correct += (pred.argmax(1) == y).type(torch.float).sum().item() if batch % 100 == 0: loss, current = loss.item(), batch * len(X) #print(f"loss: {loss:>7f} [{current:>5d}/{size:>5d}]") train_loss /= num_batches correct /= size print(f"train Error: \n Accuracy: {(100correct):>0.1f}%, Avg loss: {train*_loss:>8f} \n")

2. 迭代数据加载器中的每个批次，其中X是输入图像，y是对应的标签。 3. 将数据和标签移动到设备（如GPU）上进行计算。 4. 计算模型对输入图像的预测，并使用损失函数计算预测误差。 5. 将优化器的梯度置零，然后...

def _step(self): num_train = self.X_train.shape[0] batch_mask = np.random.choice(num_train, self.batch_size) X_batch = self.X_train[batch_mask] y_batch = self.y_train[batch_mask] loss, grads = self.model.loss(X_batch, y_batch) self.loss_history.append(loss) for p, w in self.model.params.items(): dw = grads[p] config = self.optim_configs[p] next_w, next_config = self.update_rule(w, dw, config) self.model.params[p] = next_w self.optim_configs[p] = next_config

2. 使用该批次数据计算损失值和梯度。 3. 将损失值记录在历史记录中。 4. 对于每个参数，通过更新规则（如随机梯度下降）更新参数值。 5. 将更新后的参数值和优化器配置保存。该函数的作用是完成一次训练迭代，...

def train(generator, discriminator, combined, network_input, network_output): epochs = 100 batch_size = 128 half_batch = int(batch_size / 2) filepath = "03weights-{epoch:02d}-{loss:.4f}.hdf5" checkpoint = ModelCheckpoint(filepath, monitor='val_loss', save_best_only=True) for epoch in range(*epochs): # 训练判别器 idx = np.random.randint(0, network_input.shape[0], half_batch) real_input = network_input[idx] real_output = network_output[idx] fake_output = generator.predict(np.random.rand(half_batch, 100, 1)) d_loss_real = discriminator.train_on_batch(real_input, real_output) d_loss_fake = discriminator.train_on_batch(fake_output, np.zeros((half_batch, 1))) d_loss = 0.5 np.add(d_loss_real, d_loss_fake) # 训练生成器 idx = np.random.randint(0, network_input.shape[0], batch_size) real_input = network_input[idx] real_output = network_output[idx] g_loss = combined.train_on_batch(real_input, real_output) # 输出训练结果 print('Epoch %d/%d: D loss: %f, G loss: %f' % (epoch + 1, epochs, d_loss, g_loss)) # 调用回调函数，保存模型参数 checkpoint.on_epoch_end(epoch, logs={'d_loss': d_loss, 'g_loss': g_loss})

其中使用了一个生成器（generator）、一个判别器（discriminator）和一个组合网络（combined）。GAN 由生成器和判别器两个网络组成，生成器用于生成与真实数据相似的假数据，判别器用于判断输入数据是真实数据还是...

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))

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，并对两种数据进行训练。整个 GAN 的训练过程则是先训练判别器，再固定判别器的参数，训练生成器，使生成的假数据更接近于真实数据。每 10...

KeyPhraseGeneration-BERT:克隆此存储库，然后从scibert repo安装pytorch-pretrained-BERT，解压权重（将其权重转储文件重命名为pytorch_model.bin）并将vocab文件转换为新的文件夹模型。相应地在experimentsbase_modelparams.json中更改参数。如果GPU的VRAM约为11 GB，我们建议将批大小保持为4，序列长度为512，间隔为6个周期。要进行培训，请运行命令python train.py --data_

KeyPhraseGeneration-BERT 克隆此存储库，然后从scibert repo安装pytorch-pretrained-BERT，解压权重（将其权重转储文件重命名为pytorch_model.bin）并将vocab文件转换为新的文件夹模型。在experiments / base_model / params.json中相应地更改参数。如果GPU的VRAM约为11 GB，我们建议将批大小保持为4，序列长度为512，间隔为6个周期。要进行培训，请运行命令python train.py --data_dir数据/任务1 / --bert_model_dir模型/ --model_dir实验/ base_model要进行评估，请运行命令python评估.py --data_dir数据/任务1 / --bert_model_dir模型/ --model_dir实验/ base

BERT-train2deploy:BERT模型从训练到部署

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def train_batch_ch13(net, X, y, loss, trainer, devices):

d2l.train_batch_ch13(net, features, labels, loss, trainer, devices)是用的哪个算法？

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def train_batch_ch13(net, X, y, loss, trainer, devices):

d2l.train_batch_ch13(net, features, labels, loss, trainer, devices)是用的哪个算法？

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l, acc = d2l.train_batch_ch13(net, features, labels, loss, trainer, devices) RuntimeError: Input type (torch.cuda.FloatTensor) and weight type (torch.FloatTensor) should be the same

BERT-train2deploy:BERT模型从训练到部署

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