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# Default ignored files
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/shelf/
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/workspace.xml
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# Editor-based HTTP Client requests
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/httpRequests/
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# Datasource local storage ignored files
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/dataSources/
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/dataSources.local.xml
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<component name="InspectionProjectProfileManager">
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<settings>
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<option name="USE_PROJECT_PROFILE" value="false" />
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<version value="1.0" />
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</settings>
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</component>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="Black">
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<option name="sdkName" value="Python 3.13 (大作业)" />
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</component>
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<component name="ProjectRootManager" version="2" project-jdk-name="Python 3.13 (大作业)" project-jdk-type="Python SDK" />
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/.idea/大作业.iml" filepath="$PROJECT_DIR$/.idea/大作业.iml" />
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</modules>
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="VcsDirectoryMappings">
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<mapping directory="$PROJECT_DIR$" vcs="Git" />
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</component>
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</project>
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<?xml version="1.0" encoding="UTF-8"?>
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<module type="PYTHON_MODULE" version="4">
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<component name="NewModuleRootManager">
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<content url="file://$MODULE_DIR$">
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<excludeFolder url="file://$MODULE_DIR$/.venv" />
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</content>
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<orderEntry type="jdk" jdkName="Python 3.13 (大作业)" jdkType="Python SDK" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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import torch
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import torch.nn as nn
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import torch.optim as optim
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import numpy as np
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import pandas as pd
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from sklearn.preprocessing import StandardScaler
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import joblib
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import os
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import sys
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# 添加项目根目录到Python路径
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sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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class AutoEncoder(nn.Module):
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"""
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自编码器用于异常检测
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"""
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def __init__(self, input_dim, hidden_dim1, hidden_dim2):
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super(AutoEncoder, self).__init__()
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# 编码器
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self.encoder = nn.Sequential(
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nn.Linear(input_dim, hidden_dim1),
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nn.ReLU(True),
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nn.Linear(hidden_dim1, hidden_dim2),
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nn.ReLU(True)
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)
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# 解码器
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self.decoder = nn.Sequential(
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nn.Linear(hidden_dim2, hidden_dim1),
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nn.ReLU(True),
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nn.Linear(hidden_dim1, input_dim),
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nn.ReLU(True)
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)
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def forward(self, x):
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x = self.encoder(x)
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x = self.decoder(x)
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return x
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class AdversarialAutoEncoder(nn.Module):
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"""
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对抗自编码器
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"""
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def __init__(self, input_dim, hidden_dim1, hidden_dim2, latent_dim):
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super(AdversarialAutoEncoder, self).__init__()
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# 编码器
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self.encoder = nn.Sequential(
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nn.Linear(input_dim, hidden_dim1),
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nn.ReLU(True),
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nn.Linear(hidden_dim1, hidden_dim2),
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nn.ReLU(True),
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nn.Linear(hidden_dim2, latent_dim),
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nn.ReLU(True)
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)
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# 解码器
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self.decoder = nn.Sequential(
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nn.Linear(latent_dim, hidden_dim2),
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nn.ReLU(True),
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nn.Linear(hidden_dim2, hidden_dim1),
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nn.ReLU(True),
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nn.Linear(hidden_dim1, input_dim),
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nn.Sigmoid() # 使用Sigmoid确保输出在0-1之间
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)
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# 判别器
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self.discriminator = nn.Sequential(
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nn.Linear(latent_dim, hidden_dim2),
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nn.ReLU(True),
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nn.Linear(hidden_dim2, hidden_dim1),
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nn.ReLU(True),
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nn.Linear(hidden_dim1, 1),
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nn.Sigmoid()
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)
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def encode(self, x):
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return self.encoder(x)
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def decode(self, z):
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return self.decoder(z)
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def discriminate(self, z):
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return self.discriminator(z)
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def forward(self, x):
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z = self.encode(x)
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recon_x = self.decode(z)
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return recon_x, z
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def train_adversarial_autoencoder():
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"""
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训练对抗自编码器
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"""
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# 读取数据
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print("读取信贷数据...")
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df = pd.read_csv('data/credit_data.csv')
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# 只使用数值特征进行自编码器训练
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numerical_features = ['age', 'income', 'employment_length', 'loan_amount',
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'credit_score', 'debt_to_income', 'num_credit_lines']
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X = df[numerical_features]
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# 标准化数据
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scaler = StandardScaler()
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X_scaled = scaler.fit_transform(X)
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# 转换为PyTorch张量
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X_tensor = torch.FloatTensor(X_scaled)
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# 设置模型参数
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input_dim = X_tensor.shape[1]
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hidden_dim1 = 64
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hidden_dim2 = 32
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latent_dim = 16
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# 创建模型
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model = AdversarialAutoEncoder(input_dim, hidden_dim1, hidden_dim2, latent_dim)
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# 设置损失函数和优化器
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reconstruction_criterion = nn.MSELoss()
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adversarial_criterion = nn.BCELoss()
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autoencoder_optimizer = optim.Adam(
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list(model.encoder.parameters()) + list(model.decoder.parameters()),
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lr=0.001
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)
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discriminator_optimizer = optim.Adam(model.discriminator.parameters(), lr=0.001)
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# 训练模型
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num_epochs = 100
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batch_size = 64
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print("开始训练对抗自编码器...")
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for epoch in range(num_epochs):
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for i in range(0, len(X_tensor), batch_size):
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batch = X_tensor[i:i+batch_size]
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# 训练自编码器
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autoencoder_optimizer.zero_grad()
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recon_batch, latent_batch = model(batch)
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real_labels = torch.ones(batch.size(0), 1)
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fake_labels = torch.zeros(batch.size(0), 1)
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# 重构损失
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recon_loss = reconstruction_criterion(recon_batch, batch)
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# 对抗损失 - 生成器希望判别器将生成的潜在向量识别为真实
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disc_fake = model.discriminate(latent_batch)
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adversarial_loss = adversarial_criterion(disc_fake, real_labels)
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autoencoder_loss = recon_loss + 0.1 * adversarial_loss
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autoencoder_loss.backward()
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autoencoder_optimizer.step()
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# 训练判别器
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discriminator_optimizer.zero_grad()
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# 真实潜在向量（从标准正态分布采样）
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real_latent = torch.randn(batch.size(0), latent_dim)
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disc_real = model.discriminate(real_latent)
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disc_real_loss = adversarial_criterion(disc_real, real_labels)
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# 生成的潜在向量
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disc_fake = model.discriminate(latent_batch.detach())
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disc_fake_loss = adversarial_criterion(disc_fake, fake_labels)
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discriminator_loss = disc_real_loss + disc_fake_loss
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discriminator_loss.backward()
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discriminator_optimizer.step()
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if (epoch + 1) % 10 == 0:
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print(f'Epoch [{epoch+1}/{num_epochs}], '
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f'Recon Loss: {recon_loss.item():.4f}, '
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f'Adversarial Loss: {adversarial_loss.item():.4f}, '
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f'Discriminator Loss: {discriminator_loss.item():.4f}')
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# 保存模型和标准化器
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print("保存对抗自编码器模型...")
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torch.save(model.state_dict(), 'models/adversarial_autoencoder.pth')
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joblib.dump(scaler, 'models/ae_scaler.pkl')
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return model, scaler
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if __name__ == "__main__":
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# 检查是否有可用的GPU
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device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
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print(f"使用设备: {device}")
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model, scaler = train_adversarial_autoencoder()
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print("对抗自编码器训练完成!")
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@ -0,0 +1,93 @@
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import sys
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import os
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# 添加项目根目录到Python路径
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sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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import pandas as pd
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import numpy as np
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from sklearn.model_selection import train_test_split
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from sklearn.metrics import accuracy_score, classification_report, confusion_matrix
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import lightgbm as lgb
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import joblib
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from data.data_generator import preprocess_data
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def train_lightgbm_model():
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"""
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||||
训练LightGBM模型用于信贷风险评估
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"""
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# 读取数据
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print("读取信贷数据...")
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df = pd.read_csv('data/credit_data.csv')
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print(f"数据形状: {df.shape}")
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# 数据预处理
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print("数据预处理...")
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X, y, scaler, le_education, le_home, le_purpose = preprocess_data(df)
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# 分割数据集
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X_train, X_test, y_train, y_test = train_test_split(
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X, y, test_size=0.2, random_state=42, stratify=y
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)
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print(f"训练集大小: {X_train.shape}")
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print(f"测试集大小: {X_test.shape}")
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# 创建LightGBM分类器
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print("创建LightGBM模型...")
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model = lgb.LGBMClassifier(
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n_estimators=200,
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max_depth=8,
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learning_rate=0.05,
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num_leaves=64,
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subsample=0.8,
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colsample_bytree=0.8,
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random_state=42,
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verbose=-1
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)
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# 训练模型
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print("训练模型...")
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model.fit(X_train, y_train,
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eval_set=[(X_test, y_test)],
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eval_metric='binary_logloss',
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callbacks=[lgb.early_stopping(10), lgb.log_evaluation(10)])
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# 预测
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print("模型预测...")
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y_pred = model.predict(X_test)
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y_pred_proba = model.predict_proba(X_test)[:, 1]
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# 评估模型
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accuracy = accuracy_score(y_test, y_pred)
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print(f"模型准确率: {accuracy:.4f}")
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print("\n分类报告:")
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print(classification_report(y_test, y_pred))
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print("\n混淆矩阵:")
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print(confusion_matrix(y_test, y_pred))
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# 保存模型和预处理器
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print("保存模型和预处理器...")
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joblib.dump(model, 'models/lightgbm_model.pkl')
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joblib.dump(scaler, 'models/scaler.pkl')
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joblib.dump(le_education, 'models/le_education.pkl')
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joblib.dump(le_home, 'models/le_home.pkl')
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joblib.dump(le_purpose, 'models/le_purpose.pkl')
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# 特征重要性
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feature_importance = pd.DataFrame({
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'feature': X.columns,
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'importance': model.feature_importances_
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}).sort_values('importance', ascending=False)
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print("\n特征重要性:")
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print(feature_importance)
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return model, scaler, le_education, le_home, le_purpose
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if __name__ == "__main__":
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model, scaler, le_education, le_home, le_purpose = train_lightgbm_model()
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print("\n模型训练完成!")
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@ -0,0 +1,88 @@
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import sys
|
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import os
|
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|
||||
# 添加项目根目录到Python路径
|
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sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
|
||||
|
||||
import pandas as pd
|
||||
import numpy as np
|
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from sklearn.model_selection import train_test_split
|
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from sklearn.metrics import accuracy_score, classification_report, confusion_matrix
|
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import xgboost as xgb
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import joblib
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|
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from data.data_generator import preprocess_data
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|
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def train_xgboost_model():
|
||||
"""
|
||||
训练XGBoost模型用于信贷风险评估
|
||||
"""
|
||||
# 读取数据
|
||||
print("读取信贷数据...")
|
||||
df = pd.read_csv('data/credit_data.csv')
|
||||
print(f"数据形状: {df.shape}")
|
||||
|
||||
# 数据预处理
|
||||
print("数据预处理...")
|
||||
X, y, scaler, le_education, le_home, le_purpose = preprocess_data(df)
|
||||
|
||||
# 分割数据集
|
||||
X_train, X_test, y_train, y_test = train_test_split(
|
||||
X, y, test_size=0.2, random_state=42, stratify=y
|
||||
)
|
||||
|
||||
print(f"训练集大小: {X_train.shape}")
|
||||
print(f"测试集大小: {X_test.shape}")
|
||||
|
||||
# 创建XGBoost分类器
|
||||
print("创建XGBoost模型...")
|
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model = xgb.XGBClassifier(
|
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n_estimators=100,
|
||||
max_depth=6,
|
||||
learning_rate=0.1,
|
||||
subsample=0.8,
|
||||
colsample_bytree=0.8,
|
||||
random_state=42
|
||||
)
|
||||
|
||||
# 训练模型
|
||||
print("训练模型...")
|
||||
model.fit(X_train, y_train)
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||||
|
||||
# 预测
|
||||
print("模型预测...")
|
||||
y_pred = model.predict(X_test)
|
||||
y_pred_proba = model.predict_proba(X_test)[:, 1]
|
||||
|
||||
# 评估模型
|
||||
accuracy = accuracy_score(y_test, y_pred)
|
||||
print(f"模型准确率: {accuracy:.4f}")
|
||||
|
||||
print("\n分类报告:")
|
||||
print(classification_report(y_test, y_pred))
|
||||
|
||||
print("\n混淆矩阵:")
|
||||
print(confusion_matrix(y_test, y_pred))
|
||||
|
||||
# 保存模型和预处理器
|
||||
print("保存模型和预处理器...")
|
||||
joblib.dump(model, 'models/xgboost_model.pkl')
|
||||
joblib.dump(scaler, 'models/scaler.pkl')
|
||||
joblib.dump(le_education, 'models/le_education.pkl')
|
||||
joblib.dump(le_home, 'models/le_home.pkl')
|
||||
joblib.dump(le_purpose, 'models/le_purpose.pkl')
|
||||
|
||||
# 特征重要性
|
||||
feature_importance = pd.DataFrame({
|
||||
'feature': X.columns,
|
||||
'importance': model.feature_importances_
|
||||
}).sort_values('importance', ascending=False)
|
||||
|
||||
print("\n特征重要性:")
|
||||
print(feature_importance)
|
||||
|
||||
return model, scaler, le_education, le_home, le_purpose
|
||||
|
||||
if __name__ == "__main__":
|
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model, scaler, le_education, le_home, le_purpose = train_xgboost_model()
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print("\n模型训练完成!")
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