范例01：
//只提供y_true和y_pred
y_true := array(0, 1, 0, 0, 1, 0);
y_pred := array(0, 1, 0, 0, 0, 1);
return balanced_accuracy_score(y_true,y_pred); //0.625
范例02：
//指定sample_weight
y_true := array(0, 1, 0, 0, 1, 0);
y_pred := array(0, 1, 0, 0, 0, 1);
sample_weight := array(1,1,1,1,1,2);
return balanced_accuracy_score(y_true,y_pred,sample_weight); //0.55
范例03：
//设定adjusted为真，计算调整后平衡准确率
y_true := array(0, 1, 0, 0, 1, 0);
y_pred := array(0, 1, 0, 0, 0, 1);
adjusted := true;
return balanced_accuracy_score(y_true,y_pred,nil,adjusted); //0.25