Y_predicted=
[ 1.22770607 -0.04569864 2.23941551 1.35143415 1.28991445 0.01398049 1.05511961 1.84491163 1.36748873 1.06369944 1.7139329 -0.09376361 -0.16512009 -0.0847085 -0.03141076 1.40425663 2.01371189 1.03977449 1.27667011 1.98481437 0.01295936 1.60489574 0.0823478 1.92856356 1.8584911 1.8970799 1.79401204 2.05206755 0.018738 0.00754765 -0.14906387 -0.0721375 1.18370287 -0.00857916 -0.03033274 1.69166794 1.29215806 -0.08232208 -0.09134106 -0.1708265 1.76007136 1.38080694 1.31560775 -0.06333357 -0.11464793 0.94925056 1.47575594 1.71846632 1.19986579 2.15035351 1.19564044 2.04054474 1.38920784 -0.09675278 2.00947585 1.00163388 -0.1021645 -0.05493268 0.12571214 0.97425353]
Y_test=
[2 0 0 0 1 0 1 2 0 1 2 0 2 2 1 1 2 1 0 1 2 0 0 1 1 0 2 0 0 1 1 2 1 2 2 1 0 0 2 2 0 0 0 1 2 0 2 2 0 1 1 2 1 2 0 2 1 2 1 1 1 0 1 1 0 1 2 2 0 1 2 2 0 2 0 1 2 2 1 2 1 1 2 2 0 1 2 0 1 2]
但得分是94.2%
分类器是如何计算这个得分的?
回答:
从文档中
返回预测的决定系数R^2。决定系数R^2定义为(1 - u/v),其中u是回归平方和((y_true - y_pred) ** 2).sum(),v是残差平方和((y_true - y_true.mean()) ** 2).sum()。