❌ 回归绝对不能用 accuracy_score

回归要用：

1. mean_squared_error MSE 均方误差
2. mean_absolute_error MAE
3. r2_score R² 决定系数

3. 简单例子（分类场景正确示范）

from sklearn.metrics import accuracy_score# 真实类别y_true = [0,1,1,0,1]# 预测类别y_pred = [0,1,0,0,1]print(accuracy_score(y_true,y_pred)) # 0.8

4. 配套区分速记