更新 function.py
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2024-11-01 10:21:26 +08:00
parent 236265dbe5
commit ab3c74b657
+21
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@@ -4,6 +4,11 @@ from sklearn.preprocessing import StandardScaler
from sklearn.model_selection import train_test_split, GridSearchCV
from sklearn.linear_model import LogisticRegression
id = "202210423130"
name = "董秋"
def load_data(filepath):
data = []
labels = []
@@ -32,12 +37,24 @@ def load_data(filepath):
return np.array(data), np.array(labels)
def preprocess_data(X):
# 特征标准化
scaler = StandardScaler()
return scaler.fit_transform(X)
def train_logreg(X_train, y_train):
"""
逻辑回归训练函数,使用网格搜索优化超参数。
Args:
- X_train (numpy array): 特征数据。
- y_train (numpy array): 标签数据。
Returns:
- LogisticRegression: 训练得到的最佳模型。
"""
# 定义要调优的超参数范围
param_grid = {
'C': [0.001, 0.01, 0.1, 1, 10, 100], # 正则化参数
@@ -56,12 +73,15 @@ def train_logreg(X_train, y_train):
return grid_search.best_estimator_
def predict_logreg(inX, weights):
"""
逻辑回归预测函数。
Args:
- inX (numpy array): 输入待分类的样本。
- weights (numpy array): 训练得到的权重。
Returns:
- int: 预测的分类标签。
"""
@@ -69,6 +89,7 @@ def predict_logreg(inX, weights):
prediction_prob = 1 / (1 + np.exp(-z))
return 1 if prediction_prob >= 0.5 else 0
if __name__ == "__main__":
# 加载数据集
X, y = load_data("./data/horse-colic.data")