性能度量 2 precision

计算分类结果的查准率

sklearn.metrics.precision_score（真实标记集合，预测）

from sklearn.metrics import accuracy_score,precision_score
y_true=[1,1,1,1,1,0,0,0,0,0]
y_pred=[0,0,1,1,0,0,0,0,0,0]
print('准确率Accuracy Score:',accuracy_score(y_true,y_pred,normalize=True))
print('查准率Precision Score:',precision_score(y_true,y_pred))

准确率Accuracy Score: 0.7
查准率Precision Score: 1.0