使用scikit-learn做线性回归

最新推荐文章于 2024-11-23 10:28:15 发布

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最新推荐文章于 2024-11-23 10:28:15 发布

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CC 4.0 BY-SA版权

分类专栏： python 机器学习

本文链接：https://blog.youkuaiyun.com/lsp1991/article/details/44943133

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本文通过使用Scikit-learn库中的线性回归模型对糖尿病数据集进行预测分析。展示了如何划分训练集与测试集，并计算了模型的系数、残差平方和及方差得分。此外，还给出了预测结果的图表展示。

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官方文档中的例子：

print(__doc__)


# Code source: Jaques Grobler
# License: BSD 3 clause


import matplotlib.pyplot as plt
import numpy as np
from sklearn import datasets, linear_model

# Load the diabetes dataset
diabetes = datasets.load_diabetes()
#从文件加载数据

#diabetes = np.loadtxt('RegressionData.txt',dtype=np.float,delimiter=",")

# Use only one feature
diabetes_X = diabetes.data[:, np.newaxis]
diabetes_X_temp = diabetes_X[:, :, 2]

# Split the data into training/testing sets
diabetes_X_train = diabetes_X_temp[:-20]
diabetes_X_test = diabetes_X_temp[-20:]

# Split the targets into training/testing sets
diabetes_y_train = diabetes.target[:-20]
diabetes_y_test = diabetes.target[-20:]

# Create linear regression object
regr = linear_model.LinearRegression()

# Train the model using the training sets
regr.fit(diabetes_X_train, diabetes_y_train)

# The coefficients
print('Coefficients: \n', regr.coef_)
# The mean square error
print("Residual sum of squares: %.2f"
      % np.mean((regr.predict(diabetes_X_test) - diabetes_y_test) ** 2))
# Explained variance score: 1 is perfect prediction
print('Variance score: %.2f' % regr.score(diabetes_X_test, diabetes_y_test))

# Plot outputs
plt.scatter(diabetes_X_test, diabetes_y_test,  color='black')
plt.plot(diabetes_X_test, regr.predict(diabetes_X_test), color='blue',
         linewidth=3)

plt.xticks(())
plt.yticks(())

plt.show()