请展示如何使用Python实现逻辑回归算法,并通过具体的编程实例说明其在CS229监督学习作业中的应用。
时间: 2024-11-14 07:21:05 浏览: 27
逻辑回归是一种广泛应用于二分类问题的监督学习算法。为了帮助你解决CS229作业中的分类问题,可以使用Python中的Scikit-learn库来实现逻辑回归模型。以下是一个如何使用Python实现逻辑回归的简要指南,以及它在CS229作业中的应用示例。
参考资源链接:[Stanford CS229机器学习作业1:监督学习](https://wenku.csdn.net/doc/5omtjyp5cp?spm=1055.2569.3001.10343)
首先,确保你的环境中已经安装了Scikit-learn库。如果未安装,可以使用pip命令进行安装:`pip install scikit-learn`。
接下来,你需要准备训练数据集,通常包含特征向量和对应的标签。例如,对于一个二分类问题,标签应该是0或1。
```python
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score
# 假设X是特征数据集,y是对应的标签列表
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
# 创建逻辑回归模型实例
log_reg = LogisticRegression()
# 训练模型
log_reg.fit(X_train, y_train)
# 进行预测
y_pred = log_reg.predict(X_test)
# 计算准确率
print(
参考资源链接:[Stanford CS229机器学习作业1:监督学习](https://wenku.csdn.net/doc/5omtjyp5cp?spm=1055.2569.3001.10343)
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