回归模型性能评价指标r2_score 均方差(mean-squared-error) 平均绝对值误差(mean_absolute_error)可释方差得分 中值绝对误差(Median absolute error)

python机器学习-糖尿病数据挖掘(博主录制)

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在sklearn中包含四种评价尺度,分别为mean_squared_error、mean_absolute_error、explained_variance_score 和 r2_score。

模型越好:r2→1

模型越差:r2→0

用法示例

from sklearn.metrics import r2_score
 
y_true = [1,2,4]
y_pred = [1.5,2.8,3.5]

print(r2_score(y_true,y_pred))

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原文地址:https://www.cnblogs.com/webRobot/p/13234448.html