目标编码 def gen_target_encoding_feats(train, train_2, test, encode_cols, target_col, n_fold=10): '''生成target encoding特征''' # for training set - cv tg_feats = np.zeros((train.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train[encode_cols], train[target_col])): df_train, df_val = train.iloc[train_index], train.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for train_2 set - cv tg_feats = np.zeros((train_2.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train_2[encode_cols], train_2[target_col])): df_train, df_val = train_2.iloc[train_index], train_2.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train_2[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for testing set for col in encode_cols: target_mean_dict = train.groupby(col)[target_col].mean() test[f'{col}_mean_target'] = test[col].map(target_mean_dict) return train, train_2, test features = ['house_exist', 'debt_loan_ratio', 'industry', 'title'] train_1, train_2, test = gen_target_encoding_feats(train_1, train_2, test, features, ['isDefault'], n_fold=10) 出现报错ValueError: The truth value of a DataFrame is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().在哪里修改怎么修改

阿里移动推荐算法竞赛实践指南与模型优化

2. 在gen_feats和gen_ic_ind_feats中添加更多时间间隔，有助于捕捉用户行为的细微变化，从而提升模型的预测精度。 3. 交叉验证是评估模型性能的重要手段，可以用来选择更好的模型超参数，以提升模型的整体性能。四...

UG二次开发基础教程：API与对话框操作

例如，UF_MODL_ask_body_feats 和 UF_MODL_ask_body_features 可以根据体来查询其包含的特征；UF_MODL_ask_object_feat 根据对象查询特征；UF_MODL_ask_feat_body 用于反向查询，根据特征找到所属的体；UF_...

# 目标编码 def gen_target_encoding_feats(train, train_2, test, encode_cols, target_col, n_fold=10): '''生成target encoding特征''' # for training set - cv tg_feats = np.zeros((train.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train[encode_cols], train[target_col])): df_train, df_val = train.iloc[train_index], train.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for train_2 set - cv tg_feats = np.zeros((train_2.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train_2[encode_cols], train_2[target_col])): df_train, df_val = train_2.iloc[train_index], train_2.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train_2[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for testing set for col in encode_cols: target_mean_dict = train.groupby(col)[target_col].mean() test[f'{col}_mean_target'] = test[col].map(target_mean_dict) return train, train_2, test features = ['house_exist', 'debt_loan_ratio', 'industry', 'title'] train_1, train_2, test = gen_target_encoding_feats(train_1, train_2, test, features, ['isDefault'], n_fold=10)

这段代码是将指定的分类特征（encode_cols）进行目标编码，生成新的特征，并将这些新的特征添加到训练集(train_1)、验证集(train_2)和测试集(test)中。目标编码是一种常见的特征编码技术，它将分类变量替换为目标...

目标编码 def gen_target_encoding_feats(train, train_2, test, encode_cols, target_col, n_fold=10): '''生成target encoding特征''' # for training set - cv tg_feats = np.zeros((train.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train[encode_cols], train[target_col])): df_train, df_val = train.iloc[train_index], train.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for train_2 set - cv tg_feats = np.zeros((train_2.shape[0], len(encode_cols))) kfold = StratifiedKFold(n_splits=n_fold, random_state=1024, shuffle=True) for _, (train_index, val_index) in enumerate(kfold.split(train_2[encode_cols], train_2[target_col])): df_train, df_val = train_2.iloc[train_index], train_2.iloc[val_index] for idx, col in enumerate(encode_cols): target_mean_dict = df_train.groupby(col)[target_col].mean() if not df_val[f'{col}_mean_target'].empty: df_val[f'{col}_mean_target'] = df_val[col].map(target_mean_dict) tg_feats[val_index, idx] = df_val[f'{col}_mean_target'].values for idx, encode_col in enumerate(encode_cols): train_2[f'{encode_col}_mean_target'] = tg_feats[:, idx] # for testing set for col in encode_cols: target_mean_dict = train.groupby(col)[target_col].mean() test[f'{col}_mean_target'] = test[col].map(target_mean_dict) return train, train_2, test features = ['house_exist', 'debt_loan_ratio', 'industry', 'title'] train_1, train_2, test = gen_target_encoding_feats(train_1, train_2, test, features, ['isDefault'], n_fold=10) 出现报错

具体来说，你可以在for idx, col in enumerate(encode_cols):循环开始之前，加入以下代码： python # get all possible values for the current column col_values = set(train[col].unique()) if None in col...

def init(self, n_feats, ratio=2): super(RRRB, self).init()

构造函数的参数有两个，n_feats和ratio，默认值为2。在构造函数中没有其他具体的逻辑代码。这个构造函数使用了super函数来调用父类的构造函数，并将n_feats作为参数传递给父类的构造函数。这样做是为了保证在创建...

解释以下代码意义：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组

然后，使用fit()方法对随机森林分类器进行训练，其中train_feats是训练数据集的特征矩阵，train_target是训练数据集的目标变量数组。需要注意的是，train_target.ravel()将train_target数组转换为一维数组，以便与...

DataConversionWarning: A column-vector y was passed when a 1d array was expected. Please change the shape of y to (n_samples,), for example using ravel(). rf_clf.fit(train_feats,train_target)

这个警告是因为在训练随机森林模型时，你传递的训练目标变量train_target是一个列向量，而模型期望的是一个一维数组。你可以使用numpy的ravel()函数将列向量转换为一维数组来解决这个问题。例如，你可以这样修改代码...

class MemoryEncoding(nn.Module): def init(self, in_feats, out_feats, mem_size): super(MemoryEncoding, self).init() self.in_feats = in_feats self.out_feats = out_feats self.mem_size = mem_size self.linear_coef = nn.Linear(in_feats, mem_size, bias=True) self.act = nn.LeakyReLU(0.2, inplace=True) self.linear_w = nn.Linear(mem_size, out_feats * in_feats, bias=False)

在 __init__ 方法中，它接受三个参数：in_feats（输入特征的大小）、out_feats（输出特征的大小）和 mem_size（内存大小）。然后，它调用 super() 函数来初始化基类 nn.Module，并将输入参数保存为类的...

class PositionalEncoding(nn.Module): def init(self, num_pos_feats_x=64, num_pos_feats_y=64, num_pos_feats_z=128, temperature=10000, normalize=True, scale=None):、

其中，num_pos_feats_x、num_pos_feats_y和num_pos_feats_z分别表示在x、y和z方向上的位置特征数量；temperature是位置编码中的温度参数；normalize表示是否对位置编码进行归一化；scale表示位置编码的缩放因子。

class MemoryEncoding(nn.Module): def init(self, in_feats, out_feats, mem_size): #调用 super() 函数来初始化基类 nn.Module，并将输入参数保存为类的属性。 super(MemoryEncoding, self).init() self.in_feats = in_feats self.out_feats = out_feats self.mem_size = mem_size self.linear_coef = nn.Linear(in_feats, mem_size, bias=True) self.act = nn.LeakyReLU(0.2, inplace=True) self.linear_w = nn.Linear(mem_size, out_feats * in_feats, bias=False) def get_weight(self, x): coef = self.linear_coef(x) if self.act is not None: coef = self.act(coef) w = self.linear_w(coef) w = w.view(-1, self.out_feats, self.in_feats) return w def forward(self, h_dst, h_src): w = self.get_weight(h_dst) res = torch.einsum('boi, bi -> bo', w, h_src) return res 举个例子

memory_encoding = MemoryEncoding(in_feats, out_feats, mem_size) # 创建示例输入张量 batch_size = 2 dst_feats = in_feats src_feats = in_feats h_dst = torch.randn(batch_size, dst_feats) h_src = torch....

解释代码：def gbdt_lr(X, y): # 构建梯度提升决策树 gbc = GradientBoostingClassifier(n_estimators=20,random_state=2019, subsample=0.8, max_depth=5,min_samples_leaf=1,min_samples_split=6) gbc.fit(X, y) # 连续变量离散化 gbc_leaf = gbc.apply(X) gbc_feats = gbc_leaf.reshape(-1, 20) # 转换为onehot enc = OneHotEncoder() enc.fit(gbc_feats) gbc_new_feature = np.array(enc.transform(gbc_feats).toarray()) # 输出转换结果 print(gbc_new_feature) return gbc_new_feature X=gbdt_lr(X,y) # 划分数据集 x_train, x_val, y_train, y_val = train_test_split(X, y, test_size = 0.3, random_state = 272)

5. 使用train_test_split函数将数据集分为训练集和验证集，其中测试集占总数据集的30%。 6. 最后返回转换后的特征作为模型训练的输入。需要注意的是，这段代码中使用的GBDT模型是通过Scikit-learn库的...

def forward(self, batch_graph): node_feats = batch_graph.ndata.pop('h') node_feats = self.init_transform(node_feats) node_feats = self.gnn(batch_graph, node_feats) batch_size = batch_graph.batch_size node_feats = node_feats.view(batch_size, -1, self.output_feats) return node_feats什么意思

这是一个PyTorch中的神经网络模型的前向传播函数，输入参数是一个批量的图数据，其中包含节点特征。函数首先从图数据中提取节点特征，然后通过一个初始化变换和一个图神经网络模型对节点特征进行处理。...

class GNNLayer(nn.Module): def init(self, in_feats, out_feats, mem_size, num_rels, bias=True, activation=None, self_loop=True, dropout=0.0, layer_norm=False): super(GNNLayer, self).init() self.in_feats = in_feats self.out_feats = out_feats self.mem_size = mem_size self.num_rels = num_rels self.bias = bias self.activation = activation self.self_loop = self_loop self.layer_norm = layer_norm self.node_ME = MemoryEncoding(in_feats, out_feats, mem_size) self.rel_ME = nn.ModuleList([ MemoryEncoding(in_feats, out_feats, mem_size) for i in range(self.num_rels) ]) if self.bias: self.h_bias = nn.Parameter(torch.empty(out_feats)) nn.init.zeros_(self.h_bias) if self.layer_norm: self.layer_norm_weight = nn.LayerNorm(out_feats) self.dropout = nn.Dropout(dropout)

- in_feats：输入特征的大小。 - out_feats：输出特征的大小。 - mem_size：内存大小。 - num_rels：关系类型的数量。 - bias：是否使用偏置项。 - activation：激活函数（如果有）。 - self_loop：...

class MolecularGCN(nn.Module): def init(self, in_feats, dim_embedding=128, padding=True, hidden_feats=None, activation=None): super(MolecularGCN, self).init() self.init_transform = nn.Linear(in_feats, dim_embedding, bias=False)是什么

它的输入特征维度为 in_feats，输出特征维度为 dim_embedding，可以选择是否进行 padding，可以设置隐藏层特征维度和激活函数。其中，init_transform 是一个线性变换层，用于将输入特征转换为指定维度的特征表示。

def attention_sublayers(self, feats, embedding_layers, latent): feats = feats.view((feats.size(0), self.k, -1)) feats = feats.transpose(dim0=1, dim1=2) feats = feats + latent.unsqueeze(1) feats = feats.transpose(dim0=1, dim1=2) feats = embedding_layers(feats).squeeze(-1) p = F.softmax(feats, dim=1) return p def forward(self, x): conv2_2 = self.conv2_2(x) conv3_4 = self.conv3_4(conv2_2) conv4_4 = self.conv4_4(conv3_4) conv5_4 = self.conv5_4(conv4_4) x = F.relu(self.fc4(self.fc_layers(self.tail_layer(conv5_4).view(-1, 25088)))) attr = self.bn1(x[:, :self.k]) latent = self.bn2(x[:, self.k:]) feats_0 = self.extract_0(conv2_2) feats_1 = self.extract_1(conv3_4) feats_2 = self.extract_2(conv4_4) feats_3 = self.extract_3(conv5_4) # N x k x 14 x 14 p_0 = self.attention_sublayers(feats_0, self.fc0, latent) p_1 = self.attention_sublayers(feats_1, self.fc1, latent) p_2 = self.attention_sublayers(feats_2, self.fc2, latent) p_3 = self.attention_sublayers(feats_3, self.fc3, latent) # N x k p = p_0 + p_1 + p_2 + p_3

这里的 attention_sublayers 函数接受一个特征张量 feats，一个嵌入层列表 embedding_layers 和一个潜在特征向量 latent。它将特征张量 feats 调整为一个三维张量，然后加上潜在特征向量 latent，再把它调整回原来的...

# seeds = [2222, 5, 4, 2, 209, 4096, 2048, 1024, 2015, 1015, 820]#11 seeds = [2]#2 num_model_seed = 1 oof = np.zeros(X_train.shape[0]) prediction = np.zeros(X_test.shape[0]) feat_imp_df = pd.DataFrame({'feats': feature_name, 'imp': 0}) parameters = { 'learning_rate': 0.008, 'boosting_type': 'gbdt', 'objective': 'binary', 'metric': 'auc', 'num_leaves': 63, 'feature_fraction': 0.8,#原来0.8 'bagging_fraction': 0.8, 'bagging_freq': 5,#5 'seed': 2, 'bagging_seed': 1, 'feature_fraction_seed': 7, 'min_data_in_leaf': 20, 'verbose': -1, 'n_jobs':4 } fold = 5 for model_seed in range(num_model_seed): print(seeds[model_seed],"--------------------------------------------------------------------------------------------") oof_cat = np.zeros(X_train.shape[0]) prediction_cat = np.zeros(X_test.shape[0]) skf = StratifiedKFold(n_splits=fold, random_state=seeds[model_seed], shuffle=True) for index, (train_index, test_index) in enumerate(skf.split(X_train, y)): train_x, test_x, train_y, test_y = X_train[feature_name].iloc[train_index], X_train[feature_name].iloc[test_index], y.iloc[train_index], y.iloc[test_index] dtrain = lgb.Dataset(train_x, label=train_y) dval = lgb.Dataset(test_x, label=test_y) lgb_model = lgb.train( parameters, dtrain, num_boost_round=10000, valid_sets=[dval], early_stopping_rounds=100, verbose_eval=100, ) oof_cat[test_index] += lgb_model.predict(test_x,num_iteration=lgb_model.best_iteration) prediction_cat += lgb_model.predict(X_test,num_iteration=lgb_model.best_iteration) / fold feat_imp_df['imp'] += lgb_model.feature_importance() del train_x del test_x del train_y del test_y del lgb_model oof += oof_cat / num_model_seed prediction += prediction_cat / num_model_seed gc.collect()解释上面的python代码

2. num_model_seed: 随机数种子的数量，用于多次随机划分数据集并训练多个模型，以降低随机划分的影响。 3. oof 和 prediction: 用于存储交叉验证和预测结果的数组，分别表示 out-of-fold 和测试集的结果。 4....

train_dataset = LegacyPPIDataset(mode='train') valid_dataset = LegacyPPIDataset(mode='valid') test_dataset = LegacyPPIDataset(mode='test') train_dataloader = DataLoader(train_dataset, batch_size=batch_size, collate_fn=collate) valid_dataloader = DataLoader(valid_dataset, batch_size=batch_size, collate_fn=collate) test_dataloader = DataLoader(test_dataset, batch_size=batch_size, collate_fn=collate) n_classes = train_dataset._labels.shape[1] num_feats = train_dataset.features.shape[1]

这段代码是用来加载和处理数据集的。其中LegacyPPIDataset是一个自定义的数据集类，用于加载PPID...n_classes和num_feats分别表示类别数和特征数量。这段代码的作用是将数据集加载到内存中，方便模型训练。

Python手势识别会议管理系统源代码解析

- online_test.py 和 offline_test.py文件可能涉及系统的测试代码，分别用于在线测试和离线测试场景。 - opts.py、spatial_transforms.py、dataset.py、model.py、feats_extract.py 这些文件名暗示了它们可能是进行...

深度学习框架Keras下的语音情感识别技术实现与应用

- train.py：该文件包含用于训练模型的代码。它将加载数据集，执行数据预处理，然后使用定义好的模型结构（LSTM、CNN、SVM、MLP等）进行训练，同时会保存训练过程中的检查点（checkpoints）。 - predict.py：该文件...

相关推荐

阿里移动推荐算法竞赛实践指南与模型优化

UG二次开发基础教程：API与对话框操作

def __init__(self, n_feats, ratio=2): super(RRRB, self).__init__()

解释以下代码意义 ：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组

DataConversionWarning: A column-vector y was passed when a 1d array was expected. Please change the shape of y to (n_samples,), for example using ravel(). rf_clf.fit(train_feats,train_target)

class PositionalEncoding(nn.Module): def __init__(self, num_pos_feats_x=64, num_pos_feats_y=64, num_pos_feats_z=128, temperature=10000, normalize=True, scale=None):、

def forward(self, batch_graph): node_feats = batch_graph.ndata.pop('h') node_feats = self.init_transform(node_feats) node_feats = self.gnn(batch_graph, node_feats) batch_size = batch_graph.batch_size node_feats = node_feats.view(batch_size, -1, self.output_feats) return node_feats什么意思

class MolecularGCN(nn.Module): def __init__(self, in_feats, dim_embedding=128, padding=True, hidden_feats=None, activation=None): super(MolecularGCN, self).__init__() self.init_transform = nn.Linear(in_feats, dim_embedding, bias=False)是什么

Python手势识别会议管理系统源代码解析

深度学习框架Keras下的语音情感识别技术实现与应用

最新推荐

JHU荣誉单变量微积分课程教案介绍

管理建模和仿真的文件

【实战篇：自定义损失函数】：构建独特损失函数解决特定问题，优化模型性能

如何在ZYNQMP平台上配置TUSB1210 USB接口芯片以实现Host模式，并确保与Linux内核的兼容性？

Naruto爱好者必备CLI测试应用

"互动学习：行动中的多样性与论文攻读经历"

【强化学习损失函数探索】：奖励函数与损失函数的深入联系及优化策略

如何在Springboot后端项目中实现前端的多人视频会议功能，并使用Vue.js与ElementUI进行界面开发？

Android应用显示Ignaz-Taschner-Gymnasium取消课程概览

关系数据表示学习

def init(self, n_feats, ratio=2): super(RRRB, self).init()

解释以下代码意义：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组

class PositionalEncoding(nn.Module): def init(self, num_pos_feats_x=64, num_pos_feats_y=64, num_pos_feats_z=128, temperature=10000, normalize=True, scale=None):、

class MolecularGCN(nn.Module): def init(self, in_feats, dim_embedding=128, padding=True, hidden_feats=None, activation=None): super(MolecularGCN, self).init() self.init_transform = nn.Linear(in_feats, dim_embedding, bias=False)是什么