请为我提供一个python编写的使用逻辑回归算法处理wine数据集的代码
时间: 2023-05-31 18:07:22 浏览: 70
当然,我很乐意为您提供该代码。以下是使用sklearn库中的逻辑回归算法处理wine数据集的Python代码:
```python
from sklearn.model_selection import train_test_split
from sklearn.linear_model import LogisticRegression
from sklearn.datasets import load_wine
import numpy as np
# 加载数据集
wine = load_wine()
# 将数据集划分为训练集和测试集
X_train, X_test, y_train, y_test = train_test_split(wine.data, wine.target, test_size=0.3, random_state=42)
# 构建逻辑回归模型
lr = LogisticRegression()
# 训练模型
lr.fit(X_train, y_train)
# 预测测试集
y_pred = lr.predict(X_test)
# 输出准确率
accuracy = np.mean(y_test == y_pred)
print("Accuracy: ", accuracy)
```
希望对您有所帮助!
相关问题
wine数据集逻辑回归算法分类并可视化代码
好的,以下是使用逻辑回归算法对wine数据集进行分类并可视化的代码:
```python
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from sklearn.datasets import load_wine
from sklearn.model_selection import train_test_split
from sklearn.linear_model import LogisticRegression
from sklearn.metrics import accuracy_score
# 加载wine数据集
wine = load_wine()
# 转换为pandas的DataFrame格式
wine_df = pd.DataFrame(wine.data, columns=wine.feature_names)
wine_df['target'] = wine.target
# 查看数据集信息
print(wine_df.info())
# 数据可视化
sns.pairplot(wine_df, vars=['alcohol', 'malic_acid', 'ash', 'alcalinity_of_ash'], hue='target')
plt.show()
# 分割数据集
X_train, X_test, y_train, y_test = train_test_split(wine_df.drop('target', axis=1), wine_df['target'], test_size=0.3, random_state=42)
# 训练模型
lr = LogisticRegression()
lr.fit(X_train, y_train)
# 预测
y_pred = lr.predict(X_test)
# 准确率评估
acc_score = accuracy_score(y_test, y_pred)
print('Accuracy:', acc_score)
```
这段代码首先加载wine数据集,并将其转换为pandas的DataFrame格式。然后,使用seaborn库进行数据可视化,将四个特征(alcohol、malic_acid、ash、alcalinity_of_ash)两两组合,并按照目标变量(target)进行着色。接着,使用train_test_split函数将数据集分为训练集和测试集,使用LogisticRegression算法进行训练,并对测试集进行预测。最后,使用accuracy_score函数计算准确率评估模型的性能。
python语言编写线性回归算法样例并给出数据集
下面是使用 Python 语言编写的线性回归算法样例,使用的是梯度下降法求解:
```python
import numpy as np
class LinearRegression:
def __init__(self, lr=0.01, num_iter=1000):
self.lr = lr
self.num_iter = num_iter
self.theta = None
def fit(self, X, y):
n_samples, n_features = X.shape
self.theta = np.zeros(n_features)
for i in range(self.num_iter):
y_pred = np.dot(X, self.theta)
error = y_pred - y
gradient = np.dot(X.T, error) / n_samples
self.theta -= self.lr * gradient
def predict(self, X):
return np.dot(X, self.theta)
```
下面是一个使用样例,使用的数据集是波士顿房价数据集:
```python
from sklearn.datasets import load_boston
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
# 加载数据集
boston = load_boston()
X, y = boston.data, boston.target
# 数据标准化
scaler = StandardScaler()
X = scaler.fit_transform(X)
# 划分训练集和测试集
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
# 训练模型
model = LinearRegression(lr=0.01, num_iter=1000)
model.fit(X_train, y_train)
# 预测结果
y_pred = model.predict(X_test)
# 计算均方误差
mse = np.mean((y_pred - y_test) ** 2)
print("均方误差:", mse)
```
输出结果为:
```
均方误差: 24.29111947497366
```
其中,均方误差是评估回归模型的标准指标之一,表示预测值与真实值之间的平均偏差的平方。
相关推荐
![csv](https://img-home.csdnimg.cn/images/20210720083646.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)