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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