def forward_once(self, x, profile=False): y, dt = [], [] # outputs for m in self.model: if m.f != -1: # if not from previous layer x = y[m.f] if isinstance(m.f, int) else [x if j == -1 else y[j] for j in m.f] # from earlier layers if profile: try: import thop o = thop.profile(m, inputs=(x,), verbose=False)[0] / 1E9 * 2 # FLOPS except: o = 0 t = time_synchronized() for _ in range(10): _ = m(x) dt.append((time_synchronized() - t) * 100) print('%10.1f%10.0f%10.1fms %-40s' % (o, m.np, dt[-1], m.type)) x = m(x) # run y.append(x if m.i in self.save else None) # save output if profile: print('%.1fms total' % sum(dt)) return x

时间: 2024-02-10 09:22:55 浏览: 25
这是一个神经网络模型的前向传播函数。它接受一个输入张量 x,然后按照网络模型中的层次结构依次进行计算,最终输出模型的预测结果。在计算过程中,函数会调用每一层的前向计算函数,将前一层的输出作为当前层的输入,并将当前层的输出作为下一层的输入,以此类推。在每一层的计算中,函数还可以根据需要对计算时间和计算量进行统计和记录,以便进行模型优化和性能分析。最后,函数返回模型的最终输出结果。
相关问题

class FeatureExtractor(): def __init__(self, model, target_layers): self.model = model self.target_layers = target_layers self.gradients = [] def save_gradient(self, grad): self.gradients.append(grad) def __call__(self, x): outputs = [] self.gradients = [] for name, module in self.model._modules.items(): ##遍历目标层的每一个模块,比如卷积、BN,ReLU x = module(x) if name in self.target_layers: x.register_hook(self.save_gradient) #利用hook来记录目标层的梯度 outputs += [x] return outputs, x def __init__(self, model, target_layers): self.model = model model_features = nn.Sequential(*list(model.children())[:8]) self.feature_extractor = FeatureExtractor(model_features, target_layers) def get_gradients(self): return self.feature_extractor.gradients one_hot.backward() grads_val = self.extractor.get_gradients()[-1].cpu().data.numpy() 报错list index out of range ,如何修改代码解决

这个错误可能是因为 `self.feature_extractor.gradients` 这个列表为空,也就是说在调用 `get_gradients()` 函数之前,`save_gradient()` 函数没有被执行,因此没有梯度可供提取。 你可以尝试在调用 `one_hot.backward()` 之前,先通过 `self.feature_extractor(x)` 函数来提取梯度,这样就能保证在调用 `get_gradients()` 函数时,`self.feature_extractor.gradients` 列表中至少有一个梯度值了。具体代码修改如下: ``` def __init__(self, model, target_layers): self.model = model model_features = nn.Sequential(*list(model.children())[:8]) self.feature_extractor = FeatureExtractor(model_features, target_layers) def get_gradients(self, x, one_hot): self.feature_extractor(x) one_hot.backward() grads_val = self.feature_extractor.gradients[-1].cpu().data.numpy() return grads_val ``` 这样应该就能够成功提取到梯度值了。

解释代码:class MLPDataset(Dataset): def __init__(self, path): inputs = [] outputs = [] for idx, filename in enumerate(os.listdir(path)): if filename.find("input") == 0: inputs.append(np.loadtxt(path + '/' + filename)) else: outputs.append(np.loadtxt(path + '/' + filename)) self.inputs = inputs self.outputs = outputs def __len__(self): return len(self.inputs) def __getitem__(self, idx): if idx < len(self.outputs): return self.inputs[idx], self.outputs[idx] else: return self.inputs[idx]

这段代码定义了一个名为`MLPDataset`的类,它是一个自定义的数据集类,继承自`torch.utils.data.Dataset`类。这个类用于加载MLP数据集并进行预处理。 下面是对代码的解释: - `__init__(self, path)`:类的构造函数,接收一个参数`path`,表示数据集所在的文件夹路径。 - `inputs = []`:创建一个空列表`inputs`,用于存储输入数据。 - `outputs = []`:创建一个空列表`outputs`,用于存储输出数据。 - `for idx, filename in enumerate(os.listdir(path)):`:遍历指定路径下的所有文件名和索引。 - `if filename.find("input") == 0:`:如果文件名以"input"开头。 - `inputs.append(np.loadtxt(path + '/' + filename))`:使用`np.loadtxt()`函数加载文件内容并将其添加到`inputs`列表中。 - `else:`:否则(即文件名不以"input"开头)。 - `outputs.append(np.loadtxt(path + '/' + filename))`:使用`np.loadtxt()`函数加载文件内容并将其添加到`outputs`列表中。 - `self.inputs = inputs`:将输入数据列表赋值给类的实例变量`inputs`。 - `self.outputs = outputs`:将输出数据列表赋值给类的实例变量`outputs`。 - `__len__(self)`:返回数据集中样本的数量。 - `return len(self.inputs)`:返回实例变量`inputs`中的样本数量。 - `__getitem__(self, idx)`:根据给定的索引`idx`,返回对应索引处的一个样本。 - `if idx < len(self.outputs):`:如果索引小于输出数据的数量。 - `return self.inputs[idx], self.outputs[idx]`:返回输入数据和输出数据的元组。 - `else:`:否则(即索引大于等于输出数据的数量)。 - `return self.inputs[idx]`:返回输入数据。 通过创建`MLPDataset`的实例,并使用索引访问其中的样本,你可以获取到数据集中的单个样本,该样本包含一个输入数据和一个输出数据。

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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))

class NormedLinear(nn.Module): def __init__(self, feat_dim, num_classes): super().__init__() self.weight = nn.Parameter(torch.Tensor(feat_dim, num_classes)) self.weight.data.uniform_(-1, 1).renorm_(2, 1, 1e-5).mul_(1e5) def forward(self, x): return F.normalize(x, dim=1).mm(F.normalize(self.weight, dim=0)) class LearnableWeightScalingLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_norm = nn.Parameter(torch.ones(1, num_classes)) def forward(self, x): return self.classifier(x) * self.learned_norm class DisAlignLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_magnitude = nn.Parameter(torch.ones(1, num_classes)) self.learned_margin = nn.Parameter(torch.zeros(1, num_classes)) self.confidence_layer = nn.Linear(feat_dim, 1) torch.nn.init.constant_(self.confidence_layer.weight, 0.1) def forward(self, x): output = self.classifier(x) confidence = self.confidence_layer(x).sigmoid() return (1 + confidence * self.learned_magnitude) * output + confidence * self.learned_margin class MLP_ConClassfier(nn.Module): def __init__(self): super(MLP_ConClassfier, self).__init__() self.num_inputs, self.num_hiddens_1, self.num_hiddens_2, self.num_hiddens_3, self.num_outputs \ = 41, 512, 128, 32, 5 self.num_proj_hidden = 32 self.mlp_conclassfier = nn.Sequential( nn.Linear(self.num_inputs, self.num_hiddens_1), nn.ReLU(), nn.Linear(self.num_hiddens_1, self.num_hiddens_2), nn.ReLU(), nn.Linear(self.num_hiddens_2, self.num_hiddens_3), ) self.fc1 = torch.nn.Linear(self.num_hiddens_3, self.num_proj_hidden) self.fc2 = torch.nn.Linear(self.num_proj_hidden, self.num_hiddens_3) self.linearclassfier = nn.Linear(self.num_hiddens_3, self.num_outputs) self.NormedLinearclassfier = NormedLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs) self.DisAlignLinearclassfier = DisAlignLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True) self.LearnableWeightScalingLinearclassfier = LearnableWeightScalingLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True)

下面的这段python代码,哪里有错误,修改一下:import numpy as np import matplotlib.pyplot as plt import pandas as pd import torch import torch.nn as nn from torch.autograd import Variable from sklearn.preprocessing import MinMaxScaler training_set = pd.read_csv('CX2-36_1971.csv') training_set = training_set.iloc[:, 1:2].values def sliding_windows(data, seq_length): x = [] y = [] for i in range(len(data) - seq_length): _x = data[i:(i + seq_length)] _y = data[i + seq_length] x.append(_x) y.append(_y) return np.array(x), np.array(y) sc = MinMaxScaler() training_data = sc.fit_transform(training_set) seq_length = 1 x, y = sliding_windows(training_data, seq_length) train_size = int(len(y) * 0.8) test_size = len(y) - train_size dataX = Variable(torch.Tensor(np.array(x))) dataY = Variable(torch.Tensor(np.array(y))) trainX = Variable(torch.Tensor(np.array(x[1:train_size]))) trainY = Variable(torch.Tensor(np.array(y[1:train_size]))) testX = Variable(torch.Tensor(np.array(x[train_size:len(x)]))) testY = Variable(torch.Tensor(np.array(y[train_size:len(y)]))) class LSTM(nn.Module): def __init__(self, num_classes, input_size, hidden_size, num_layers): super(LSTM, self).__init__() self.num_classes = num_classes self.num_layers = num_layers self.input_size = input_size self.hidden_size = hidden_size self.seq_length = seq_length self.lstm = nn.LSTM(input_size=input_size, hidden_size=hidden_size, num_layers=num_layers, batch_first=True) self.fc = nn.Linear(hidden_size, num_classes) def forward(self, x): h_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) c_0 = Variable(torch.zeros( self.num_layers, x.size(0), self.hidden_size)) # Propagate input through LSTM ula, (h_out, _) = self.lstm(x, (h_0, c_0)) h_out = h_out.view(-1, self.hidden_size) out = self.fc(h_out) return out num_epochs = 2000 learning_rate = 0.001 input_size = 1 hidden_size = 2 num_layers = 1 num_classes = 1 lstm = LSTM(num_classes, input_size, hidden_size, num_layers) criterion = torch.nn.MSELoss() # mean-squared error for regression optimizer = torch.optim.Adam(lstm.parameters(), lr=learning_rate) # optimizer = torch.optim.SGD(lstm.parameters(), lr=learning_rate) runn = 10 Y_predict = np.zeros((runn, len(dataY))) # Train the model for i in range(runn): print('Run: ' + str(i + 1)) for epoch in range(num_epochs): outputs = lstm(trainX) optimizer.zero_grad() # obtain the loss function loss = criterion(outputs, trainY) loss.backward() optimizer.step() if epoch % 100 == 0: print("Epoch: %d, loss: %1.5f" % (epoch, loss.item())) lstm.eval() train_predict = lstm(dataX) data_predict = train_predict.data.numpy() dataY_plot = dataY.data.numpy() data_predict = sc.inverse_transform(data_predict) dataY_plot = sc.inverse_transform(dataY_plot) Y_predict[i,:] = np.transpose(np.array(data_predict)) Y_Predict = np.mean(np.array(Y_predict)) Y_Predict_T = np.transpose(np.array(Y_Predict))

为以下代码写注释:class TransformerClassifier(torch.nn.Module): def __init__(self, num_labels): super().__init__() self.bert = BertForSequenceClassification.from_pretrained('bert-base-chinese', num_labels=num_labels) # print(self.bert.config.hidden_size) #768 self.dropout = torch.nn.Dropout(0.1) self.classifier1 = torch.nn.Linear(640, 256) self.classifier2 = torch.nn.Linear(256, num_labels) self.regress1 = torch.nn.Linear(640, 256) self.regress2 = torch.nn.Linear(256, 2) self.regress3 = torch.nn.Linear(640, 256) self.regress4 = torch.nn.Linear(256, 2) # self.regress3 = torch.nn.Linear(64, 1) # self.regress3 = torch.nn.Linear(640, 256) # self.regress4 = torch.nn.Linear(256, 1) # self.soft1 = torch.nn.Softmax(dim=1) def forward(self, input_ids, attention_mask, token_type_ids): # outputs = self.bert(input_ids, attention_mask=attention_mask, token_type_ids=token_type_ids) # pooled_output = outputs.logits # # pooled_output = self.dropout(pooled_output) # # logits = self.classifier(pooled_output) outputs = self.bert(input_ids, attention_mask=attention_mask, token_type_ids=token_type_ids) logits = outputs.logits clas = F.relu(self.classifier1(logits)) clas = self.classifier2(clas) death = F.relu(self.regress1(logits)) # xingqi = F.relu(self.regress2(xingqi)) death = self.regress2(death) life = F.relu(self.regress3(logits)) # xingqi = F.relu(self.regress2(xingqi)) life = self.regress4(life) # fakuan = F.relu(self.regress3(logits)) # fakuan = self.regress4(fakuan) # print(logits.shape) # logits = self.soft1(logits) # print(logits) # print(logits.shape) return clas,death,life

def define_gan(self): self.generator_aux=Generator(self.hidden_dim).build(input_shape=(self.seq_len, self.n_seq)) self.supervisor=Supervisor(self.hidden_dim).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.discriminator=Discriminator(self.hidden_dim).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.recovery = Recovery(self.hidden_dim, self.n_seq).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.embedder = Embedder(self.hidden_dim).build(input_shape=(self.seq_len, self.n_seq)) X = Input(shape=[self.seq_len, self.n_seq], batch_size=self.batch_size, name='RealData') Z = Input(shape=[self.seq_len, self.n_seq], batch_size=self.batch_size, name='RandomNoise') # AutoEncoder H = self.embedder(X) X_tilde = self.recovery(H) self.autoencoder = Model(inputs=X, outputs=X_tilde) # Adversarial Supervise Architecture E_Hat = self.generator_aux(Z) H_hat = self.supervisor(E_Hat) Y_fake = self.discriminator(H_hat) self.adversarial_supervised = Model(inputs=Z, outputs=Y_fake, name='AdversarialSupervised') # Adversarial architecture in latent space Y_fake_e = self.discriminator(E_Hat) self.adversarial_embedded = Model(inputs=Z, outputs=Y_fake_e, name='AdversarialEmbedded') #Synthetic data generation X_hat = self.recovery(H_hat) self.generator = Model(inputs=Z, outputs=X_hat, name='FinalGenerator') # Final discriminator model Y_real = self.discriminator(H) self.discriminator_model = Model(inputs=X, outputs=Y_real, name="RealDiscriminator") # Loss functions self._mse=MeanSquaredError() self._bce=BinaryCrossentropy()

import torch import torch.nn as nn import pandas as pd from sklearn.model_selection import train_test_split # 加载数据集 data = pd.read_csv('../dataset/train_10000.csv') # 数据预处理 X = data.drop('target', axis=1).values y = data['target'].values X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) X_train = torch.from_numpy(X_train).float() X_test = torch.from_numpy(X_test).float() y_train = torch.from_numpy(y_train).float() y_test = torch.from_numpy(y_test).float() # 定义LSTM模型 class LSTMModel(nn.Module): def __init__(self, input_size, hidden_size, num_layers, output_size): super(LSTMModel, self).__init__() self.hidden_size = hidden_size self.num_layers = num_layers self.lstm = nn.LSTM(input_size, hidden_size, num_layers, batch_first=True) self.fc = nn.Linear(hidden_size, output_size) def forward(self, x): h0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size).to(x.device) c0 = torch.zeros(self.num_layers, x.size(0), self.hidden_size).to(x.device) out, _ = self.lstm(x, (h0, c0)) out = self.fc(out[:, -1, :]) return out # 初始化模型和定义超参数 input_size = X_train.shape[1] hidden_size = 64 num_layers = 2 output_size = 1 model = LSTMModel(input_size, hidden_size, num_layers, output_size) criterion = nn.MSELoss() optimizer = torch.optim.Adam(model.parameters(), lr=0.001) # 训练模型 num_epochs = 100 for epoch in range(num_epochs): model.train() outputs = model(X_train) loss = criterion(outputs, y_train) optimizer.zero_grad() loss.backward() optimizer.step() if (epoch+1) % 10 == 0: print(f'Epoch [{epoch+1}/{num_epochs}], Loss: {loss.item():.4f}') # 在测试集上评估模型 model.eval() with torch.no_grad(): outputs = model(X_test) loss = criterion(outputs, y_test) print(f'Test Loss: {loss.item():.4f}') 我有额外的数据集CSV,请帮我数据集和测试集分离

生成torch代码:class ConcreteAutoencoderFeatureSelector(): def __init__(self, K, output_function, num_epochs=300, batch_size=None, learning_rate=0.001, start_temp=10.0, min_temp=0.1, tryout_limit=1): self.K = K self.output_function = output_function self.num_epochs = num_epochs self.batch_size = batch_size self.learning_rate = learning_rate self.start_temp = start_temp self.min_temp = min_temp self.tryout_limit = tryout_limit def fit(self, X, Y=None, val_X=None, val_Y=None): if Y is None: Y = X assert len(X) == len(Y) validation_data = None if val_X is not None and val_Y is not None: assert len(val_X) == len(val_Y) validation_data = (val_X, val_Y) if self.batch_size is None: self.batch_size = max(len(X) // 256, 16) num_epochs = self.num_epochs steps_per_epoch = (len(X) + self.batch_size - 1) // self.batch_size for i in range(self.tryout_limit): K.set_learning_phase(1) inputs = Input(shape=X.shape[1:]) alpha = math.exp(math.log(self.min_temp / self.start_temp) / (num_epochs * steps_per_epoch)) self.concrete_select = ConcreteSelect(self.K, self.start_temp, self.min_temp, alpha, name='concrete_select') selected_features = self.concrete_select(inputs) outputs = self.output_function(selected_features) self.model = Model(inputs, outputs) self.model.compile(Adam(self.learning_rate), loss='mean_squared_error') print(self.model.summary()) stopper_callback = StopperCallback() hist = self.model.fit(X, Y, self.batch_size, num_epochs, verbose=1, callbacks=[stopper_callback], validation_data=validation_data) # , validation_freq = 10) if K.get_value(K.mean( K.max(K.softmax(self.concrete_select.logits, axis=-1)))) >= stopper_callback.mean_max_target: break num_epochs *= 2 self.probabilities = K.get_value(K.softmax(self.model.get_layer('concrete_select').logits)) self.indices = K.get_value(K.argmax(self.model.get_layer('concrete_select').logits)) return self def get_indices(self): return K.get_value(K.argmax(self.model.get_layer('concrete_select').logits)) def get_mask(self): return K.get_value(K.sum(K.one_hot(K.argmax(self.model.get_layer('concrete_select').logits), self.model.get_layer('concrete_select').logits.shape[1]), axis=0)) def transform(self, X): return X[self.get_indices()] def fit_transform(self, X, y): self.fit(X, y) return self.transform(X) def get_support(self, indices=False): return self.get_indices() if indices else self.get_mask() def get_params(self): return self.model

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