def the_loop(net, optimizer, train_loader, val_loader=None, epochs=None, swa_model=None, swa_start=5): if epochs is None: raise Exception("a training duration must be given: set epochs") log_iterval = 1 running_mean = 0. loss = torch.Tensor([0.]).cuda() losses = [] val_losses = [] states = [] i, j = 0, 0 pbar = tqdm(train_loader, desc=f"epoch {i}", postfix={"loss": loss.item(), "step": j}) for i in range(epochs): running_mean = 0. j = 0 pbar.set_description(f"epoch {i}") pbar.refresh() pbar.reset() for j, batch in enumerate(train_loader): # implement training step by # - appending the current states to `states` # - doing a training_step # - appending the current loss to the `losses` list # - update the running_mean for logging states.append(net.state_dict()) optimizer.zero_grad() output = net(batch) batch_loss = loss_function(output, batch.target) batch_loss.backward() optimizer.step() losses.append(batch_loss.item()) running_mean = (running_mean * j + batch_loss.item()) / (j + 1) if j % log_iterval == 0 and j != 0: pbar.set_postfix({"loss": running_mean, "step": j}) running_mean = 0. pbar.update() if i > swa_start and swa_model is not None: swa_model.update_parameters(net) if val_loader is not None: val_loss = 0. with torch.no_grad(): for val_batch in val_loader: val_output = net(val_batch) val_loss += loss_function(val_output, val_batch.target).item() val_loss /= len(val_loader) val_losses.append(val_loss) pbar.refresh() if val_loader is not None: return losses, states, val_losses return losses, states net = get_OneFCNet() epochs = 10 optimizer = GD(net.parameters(), 0.002) loss_fn = nn.CrossEntropyLoss() losses, states = the_loop(net, optimizer, gd_data_loader, epochs=epochs) fig = plot_losses(losses) iplot(fig)这是之前的代码怎么修改这段代码的错误？

pso.zip_PSO_PSo- optimizer_in_swarm

New-folder.rar_Ant Lion_Ant lion optimizer_lion_lion algorithm

标题 "New-folder.rar_Ant Lion_Ant lion optimizer_lion_lion algorithm" 提及的核心概念是“蚁狮优化器”（Ant Lion Optimizer, ALO），这是一款基于生物行为的优化算法，灵感来源于蚁狮捕食的行为。蚁狮优化器在...

To do multiple steps, we implement a function the_loop that iterates over a dataloader. It should do a training step per batch for epochs. After one epoch, the loss on the validation set should be calculated.帮我根据这个要求补充完整下面代码中。。。的部分。 def the_loop(net, optimizer, train_loader, val_loader=None, epochs=None, swa_model=None, swa_start=5): if epochs is None: raise Exception("a training duration must be given: set epochs") log_iterval = 1 running_mean = 0. loss = Tensor([0.]).cuda() losses = [] val_losses = [] states = [] i, j = 0, 0 pbar = tqdm(train_loader, desc=f"epoch {i}", postfix={"loss": loss.item(), "step": j}) for i in range(epochs): running_mean = 0. j = 0 pbar.set_description(f"epoch {i}") pbar.refresh() pbar.reset() for j, batch in enumerate(train_loader): # implement training step by # - appending the current states to states # - doing a training_step # - appending the current loss to the losses list # - update the running_mean for logging ... if j % log_iterval == 0 and j != 0: pbar.set_postfix({"loss": running_mean.item(), "step": j}) running_mean = 0. pbar.update() if i > swa_start and swa_model is not None: swa_model.update_parameters(net) if val_loader is not None: # evaluate the current net on the validation data loader and # collect all losses in the ´val_loss´ list ... pbar.refresh() if val_loader is not None: return losses, states, val_losses return losses, states

def the_loop(net, optimizer, train_loader, val_loader=None, epochs=None, swa_model=None, swa_start=5): if epochs is None: raise Exception("a training duration must be given: set epochs") log_...

def train_and_evaluate(model: torch.nn.Module, optimizer: torch.optim.Optimizer, train_loader: DataLoader, valid_loader: DataLoader, num_epochs: int, device: str): """训练和评估函数""" best_valid_loss = float("inf") for epoch in range(num_epochs): train_loss = train(model, optimizer, train_loader, device) valid_loss = evaluate(model, valid_loader, device) print(f"Epoch [{epoch + 1}/{num_epochs}], Train Loss: {train_loss:.4f}, Valid Loss: {valid_loss:.4f}") if valid_loss < best_valid_loss: best_valid_loss = valid_loss torch.save(model.state_dict(), "best_model.pt") model.load_state_dict(torch.load("best_model.pt")) test_loss = evaluate(model, test_loader, device) print(f"Test Loss: {test_loss:.4f}")

- train_loader: 训练数据的DataLoader。 - valid_loader: 验证数据的DataLoader。 - num_epochs: 训练的总轮数。 - device: 训练使用的设备（GPU或CPU）。在训练过程中，函数会迭代每个epoch，并在每个...

帮我纠正这段代码# 定义模型参数 input_dim = X_train.shape[1] epochs = 100 batch_size = 32 lr = 0.001 dropout_rate = 0.5 # 定义模型结构 def create_model(): model = Sequential() model.add(Dense(64, input_dim=input_dim, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(32, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(1, activation='sigmoid')) optimizer = Adam(lr=lr) model.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=['accuracy']) return model # 5折交叉验证 kf = KFold(n_splits=5, shuffle=True, random_state=42) cv_scores = [] for train_index, test_index in kf.split(X_train): # 划分训练集和验证集 X_train_fold, X_val_fold = X_train.iloc[train_index], X_train.iloc[test_index] y_train_fold, y_val_fold = y_train_forced_turnover_nolimited.iloc[train_index], y_train_forced_turnover_nolimited.iloc[test_index] # 创建模型 model = create_model() # 定义早停策略 early_stopping = EarlyStopping(monitor='val_loss', patience=10, verbose=1) # 训练模型 model.fit(X_train_fold, y_train_fold, validation_data=(X_val_fold, y_val_fold), epochs=epochs, batch_size=batch_size, callbacks=[early_stopping], verbose=1) # 预测验证集 y_pred = model.predict(X_val_fold) # 计算AUC指标 auc = roc_auc_score(y_val_fold, y_pred) cv_scores.append(auc) # 输出交叉验证结果 print('CV AUC:', np.mean(cv_scores)) # 在全量数据上重新训练模型 model = create_model() model.fit(X_train, y_train_forced_turnover_nolimited, epochs=epochs, batch_size=batch_size, verbose=1)

- 可以检查一下数据集X_train和y_train_forced_turnover_nolimited是否已经准备好，并且数量一致。 - 可以根据实际情况调整模型参数，例如调整Dense层的大小、dropout率、学习率等等。 - 可以尝试使用其他的交叉验证...

在以下这段代码后面继续添加输出测试集、训练集AUC、f1_score、准确率的代码：# 定义模型参数 input_dim = X_train.shape[1] epochs = 100 batch_size = 32 learning_rate = 0.1 dropout_rate = 0.5 # 定义模型结构 def create_model(): model = Sequential() model.add(Dense(128, input_dim=input_dim, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(32, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(1, activation='sigmoid')) optimizer = Adam(learning_rate=learning_rate) model.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=['accuracy']) return model # 5折交叉验证 kf = KFold(n_splits=5, shuffle=True, random_state=42) cv_scores = [] for train_index, test_index in kf.split(X_train): # 划分训练集和验证集 X_train_fold, X_val_fold = X_train.iloc[train_index], X_train.iloc[test_index] y_train_fold, y_val_fold = y_train_forced_turnover_nolimited.iloc[train_index], y_train_forced_turnover_nolimited.iloc[test_index] # 创建模型 model = create_model() # 定义早停策略 early_stopping = EarlyStopping(monitor='val_loss', patience=10, verbose=1) # 训练模型 model.fit(X_train_fold, y_train_fold, validation_data=(X_val_fold, y_val_fold), epochs=epochs, batch_size=batch_size, callbacks=[early_stopping], verbose=1) # 预测验证集 y_pred = model.predict(X_val_fold) # 计算AUC指标 auc = roc_auc_score(y_val_fold, y_pred) cv_scores.append(auc) # 输出交叉验证结果 print('CV AUC:', np.mean(cv_scores)) # 在全量数据上重新训练模型 model = create_model() model.fit(X_train, y_train_forced_turnover_nolimited, epochs=epochs, batch_size=batch_size, verbose=1)

train_pred = model.predict(X_train) train_auc = roc_auc_score(y_train_forced_turnover_nolimited, train_pred) train_f1_score = f1_score(y_train_forced_turnover_nolimited, np.round(train_pred)) train_...

epochs = 200 def train(train_loader): train_ls = [] for epoch in range(epochs): loss_sum = 0 for train_batch, labels_batch in train_loader: train_batch, labels_batch = train_batch.to(device), labels_batch.to(device) #preds = torch.clamp(model(train_batch), 1, float('inf')) #l = loss(torch.log(preds), torch.log(labels_batch)) l = loss(model(train_batch),labels_batch) optimizer.zero_grad() l.backward() optimizer.step() loss_sum += l.item() train_ls.append(loss_sum) plt.plot(range(epochs), train_ls) plt.show() train(train_loader)

这段代码是一个完整的训练函数，可以将模型训练200个epochs。代码中的train_loader是一个数据加载器，用于加载训练数据集。在每个epoch中，代码会遍历train_loader中的每个batch并将其送入模型进行训练，同时计算每...

修改这段代码，使得输出训练集结果是可重复的：# 定义模型参数 input_dim = X_train.shape[1] epochs = 100 batch_size = 32 learning_rate = 0.001 dropout_rate = 0.1 # 定义模型结构 def create_model(): model = Sequential() model.add(Dense(64, input_dim=input_dim, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(32, activation='relu')) model.add(Dropout(dropout_rate)) model.add(Dense(1, activation='sigmoid')) optimizer = Adam(learning_rate=learning_rate) model.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=['accuracy']) return model # 5折交叉验证 kf = KFold(n_splits=5, shuffle=True, random_state=42) cv_scores = [] for train_index, test_index in kf.split(X_train): # 划分训练集和验证集 X_train_fold, X_val_fold = X_train.iloc[train_index], X_train.iloc[test_index] y_train_fold, y_val_fold = y_train_forced_turnover_nolimited.iloc[train_index], y_train_forced_turnover_nolimited.iloc[test_index] # 创建模型 model = create_model() # 定义早停策略 #early_stopping = EarlyStopping(monitor='val_loss', patience=10, verbose=1) # 训练模型 model.fit(X_train_fold, y_train_fold, validation_data=(X_val_fold, y_val_fold), epochs=epochs, batch_size=batch_size,verbose=1) # 预测验证集 y_pred = model.predict(X_val_fold) # 计算AUC指标 auc = roc_auc_score(y_val_fold, y_pred) cv_scores.append(auc) # 输出交叉验证结果 print('CV AUC:', np.mean(cv_scores)) # 在全量数据上重新训练模型 model = create_model() model.fit(X_train, y_train_forced_turnover_nolimited, epochs=epochs, batch_size=batch_size, verbose=1) #测试集结果 test_pred = model.predict(X_test) test_auc = roc_auc_score(y_test_forced_turnover_nolimited, test_pred) test_f1_score = f1_score(y_test_forced_turnover_nolimited, np.round(test_pred)) test_accuracy = accuracy_score(y_test_forced_turnover_nolimited, np.round(test_pred)) print('Test AUC:', test_auc) print('Test F1 Score:', test_f1_score) print('Test Accuracy:', test_accuracy) #训练集结果 train_pred = model.predict(X_train) train_auc = roc_auc_score(y_train_forced_turnover_nolimited, train_pred) train_f1_score = f1_score(y_train_forced_turnover_nolimited, np.round(train_pred)) train_accuracy = accuracy_score(y_train_forced_turnover_nolimited, np.round(train_pred)) print('Train AUC:', train_auc) print('Train F1 Score:', train_f1_score) print('Train Accuracy:', train_accuracy)

model.compile(loss='binary_crossentropy', optimizer=optimizer, metrics=['accuracy']) return model # 5折交叉验证 kf = KFold(n_splits=5, shuffle=True, random_state=42) cv_scores = [] for train_index,...

设置训练和验证集路径 train_vol_path = "data/train/trainvol" train_seg_path = "data/train/trainseg" val_vol_path = "data/val/valvol" val_seg_path = "data/val/valseg" # 定义数据生成器 train_datagen = ImageDataGenerator(rescale=1./255) val_datagen = ImageDataGenerator(rescale=1./255) # 加载训练和验证数据 train_vol = train_datagen.flow_from_directory(train_vol_path, target_size=(256, 256), batch_size=32, class_mode=None) train_seg = train_datagen.flow_from_directory(train_seg_path, target_size=(256, 256), batch_size=32, class_mode=None) val_vol = val_datagen.flow_from_directory(val_vol_path, target_size=(256, 256), batch_size=32, class_mode=None) val_seg = val_datagen.flow_from_directory(val_seg_path, target_size=(256, 256), batch_size=32, class_mode=None) # 合并训练和验证数据 train_generator = zip(train_vol, train_seg) val_generator = zip(val_vol, val_seg) # 定义UNet模型 model = unet() # 编译模型 model.compile(optimizer=Adam(learning_rate=1e-4), loss='binary_crossentropy', metrics=['accuracy'])报错'NoneType' object has no attribute 'compile'怎么改代码

可以尝试将 class_mode 参数设置为 'binary' 或者其他适合数据集的值，来解决这个问题。...model.compile(optimizer=Adam(learning_rate=1e-4), loss='binary_crossentropy', metrics=['accuracy'])

ef train(args, model, train_loader, test_loader, boardio, textio, checkpoint): #learnable_params = filter(lambda p: p.requires_grad, model.parameters()) #optimizer = torch.optim.Adam(learnable_params) optimizer = optim.Adam(model.parameters(), lr=args.lr, weight_decay=1e-4) scheduler = torch.optim.lr_scheduler.MultiStepLR(optimizer, milestones=[50, 100, 150], gamma=0.1) if checkpoint is not None: min_loss = checkpoint['min_loss'] optimizer.load_state_dict(checkpoint['optimizer']) best_test_loss = np.inf best_test_mse_ab = np.inf best_test_rmse_ab = np.inf best_test_mae_ab = np.inf best_test_r_mse_ab = np.inf best_test_r_rmse_ab = np.inf best_test_r_mae_ab = np.inf best_test_t_mse_ab = np.inf best_test_t_rmse_ab = np.inf best_test_t_mae_ab = np.inf for epoch in range(args.epochs): train_loss, train_mse_ab, train_mae_ab, train_rotations_ab, train_translations_ab, train_rotations_ab_pred, \ train_translations_ab_pred, train_eulers_ab, = train_one_epoch(args.device, model, train_loader, optimizer) test_loss, test_mse_ab, test_mae_ab, test_rotations_ab, test_translations_ab, test_rotations_ab_pred, \ test_translations_ab_pred, test_eulers_ab = test_one_epoch(args.device, model, test_loader)设置动态学习率

这段代码是用来设置动态学习率的。它使用了PyTorch中的lr_scheduler模块，具体来说，使用了MultiStepLR策略。这个策略会在训练过程中根据指定的milestones（里程碑）来调整学习率，每次乘以gamma（衰减因子）。...

# 训练模型 model.prepare(loss_fn, optimizer) history = model.fit(train_loader, epochs=num_epochs, verbose=1) TypeError: 'loss' must be sub classes of paddle.nn.Layer or any callable function.

这个错误提示意味着您传递给 model.prepare() 方法的 loss_fn 参数类型不正确。loss_fn 应该是一个继承自 ...history = model.fit(train_loader, epochs=num_epochs, verbose=1) 希望这可以帮助您解决问题。

loss_fn = nn.MSELoss() optimizer = paddle.optimizer.SGD(learning_rate=learning_rate, parameters=model.parameters()) model.prepare(loss_fn, optimizer) history = model.fit(train_loader, epochs=num_epochs, verbose=1) TypeError: 'loss' must be sub classes of paddle.nn.Layer or any callable function.

history = model.fit(train_loader, epochs=num_epochs, verbose=1) 在这里，我们定义了一个新的函数 loss_fn_wrapper，它接受模型的输出 logits 和标签 labels 作为输入，并使用 nn.MSELoss() 计算...

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 用1000字描述这段代码

这段代码是用来训练深度神经网络的，其中 model 是要被训练的模型，train_loader 是一个 PyTorch 数据加载器，criterion 是一个损失函数，optimizer 是一个优化器。在训练过程中，首先将模型设为训练模式。然后在...

for epoch in range(n_epochs): running_loss = 0.0 correct_train = 0 correct_val = 0 # 训练集 for i, (inputs, labels) in enumerate(train_loader, 0): optimizer.zero_grad() outputs = model(inputs) loss = criterion(outputs, labels) loss.backward() optimizer.step() running_loss += loss.item() _, predicted = torch.max(outputs.data, 1) correct_train += (predicted == labels).sum().item() train_acc.append(correct_train / len(train_dataset)) train_loss.append(running_loss / len(train_loader))

在循环开始时，定义了三个变量：running_loss、correct_train 和 correct_val，都初始化为 0。在循环的每一次迭代过程中，这三个变量都会被更新，记录训练过程中的损失值和正确率。n_epochs 是训练的轮数。

def train(): Dtr, Val, Dte = load_data() print('train...') epoch_num = 30 best_model = None min_epochs = 5 min_val_loss = 5 model = cnn().to(device) optimizer = optim.Adam(model.parameters(), lr=0.0008) criterion = nn.CrossEntropyLoss().to(device) # criterion = nn.BCELoss().to(device) for epoch in tqdm(range(epoch_num), ascii=True): train_loss = [] for batch_idx, (data, target) in enumerate(Dtr, 0): try: data, target = Variable(data).to(device), Variable(target.long()).to(device) # target = target.view(target.shape[0], -1) # print(target) optimizer.zero_grad() output = model(data) # print(output) loss = criterion(output, target) loss.backward() optimizer.step() train_loss.append(loss.cpu().item()) except: continue # validation val_loss = get_val_loss(model, Val) model.train() if epoch + 1 > min_epochs and val_loss < min_val_loss: min_val_loss = val_loss best_model = copy.deepcopy(model) torch.save(best_model.state_dict(), r"E:\dataset\Airbnb\training_data\model\cnn.pkl")

它的输入是经过处理的数据集 Dtr, Val, Dte，其中 Dtr 是训练集，Val 是验证集，Dte 是测试集。模型的优化器采用 Adam 算法，损失函数采用交叉熵损失。在每个 epoch 中，模型会对训练集 Dtr 进行迭代，计算损失并...

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 selflabel_train(train_loader, model, criterion, optimizer, epoch, ema=None, output_file=None): """ Self-labeling based on confident samples """ losses = AverageMeter('Loss', ':.4e') progress = ProgressMeter(len(train_loader), [losses], prefix="Epoch: [{}]".format(epoch), output_file=output_file) model.train() for i, batch in enumerate(train_loader): images = batch['image'].cuda(non_blocking=True) images_augmented = batch['image_augmented'].cuda(non_blocking=True) with torch.no_grad(): output = model(images)[0] output_augmented = model(images_augmented)[0] loss = criterion(output, output_augmented) losses.update(loss.item()) optimizer.zero_grad() loss.backward() optimizer.step() if ema is not None: # Apply EMA to update the weights of the network ema.update_params(model) ema.apply_shadow(model) if i % 25 == 0: progress.display(i)

函数接受训练数据加载器（train_loader）、模型（model）、损失函数（criterion）、优化器（optimizer）、当前的训练轮数（epoch）、指数移动平均（exponential moving average，EMA）以及输出文件路径（output_file...

def train(model, device): # 训练配置参数 max_epoch = CONFIG['max_epoch'] lr = CONFIG['lr'] weight_decay = CONFIG['weight_decay'] # 学习率调整参数 milestones = CONFIG['milestones'] gamma = CONFIG['gamma'] # 损失参数 instrument_list = CONFIG['instrument_list'] instrument_weight = CONFIG['instrument_weight'] # 模型保存路径 save_directory = CONFIG['save_directory'] if not os.path.exists(save_directory): os.makedirs(save_directory) optimizer = torch.optim.Adam(model.parameters(), lr=lr, weight_decay=weight_decay) criterion = MultiLoss(instrument_list, instrument_weight) scheduler = MultiStepLR(optimizer, milestones, gamma) train_loader, val_loader = get_data_loader() for i in range(max_epoch): start = time() t_loss = train_one_epoch(model, device, train_loader, optimizer, criterion) if val_loader is not None: v_loss = val_one_epoch(model, device, val_loader, criterion) else: v_loss = t_loss end = time() scheduler.step() msg = '' for key, value in t_loss.items(): value = value.result() msg += f'{key}:{value:.4f}\t' for key, value in v_loss.items(): value = value.result() msg += f'{key}:{value:.4f}\t' msg += f'time:{(end - start):.1f}\tepoch:{i}' print(msg) save_path = os.path.join(save_directory, 'SSD_epoch_' + str(i) + '_' + str(v_loss['loss'].result()) + '.pth') model.phase = 'test' torch.save(model, save_path) model.phase = 'train'

这段代码是一个训练函数 train(model, device)，它接受一个模型对象和设备信息作为参数。下面是对代码的解释：首先，根据配置参数加载训练的相关设置，如最大训练轮数 max_epoch，学习率 lr，权重衰减 ...

java+sql server项目之科帮网计算机配件报价系统源代码.zip

sql server+java项目之科帮网计算机配件报价系统源代码

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# 训练模型 model.prepare(loss_fn, optimizer) history = model.fit(train_loader, epochs=num_epochs, verbose=1) TypeError: 'loss' must be sub classes of paddle.nn.Layer or any callable function.

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