本文整理汇总了C++中DVector::GetN方法的典型用法代码示例。如果您正苦于以下问题：C++ DVector::GetN方法的具体用法？C++ DVector::GetN怎么用？C++ DVector::GetN使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DVector的用法示例。
在下文中一共展示了DVector::GetN方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Performance
//--------------------------------------------------------------------------
double Performance(const DVector &ytest_truth, const DVector &ytest_predict,
int NumClasses) {
long n = ytest_truth.GetN();
if (n != ytest_predict.GetN()) {
printf("Performance. Error: Vector lengths mismatch. Return NAN");
return NAN;
}
if (NumClasses != 1 && NumClasses != 2) {
printf("Performance. Error: Neither regression nor binary classification. Return NAN");
return NAN;
}
double perf = 0.0;
if (NumClasses == 1) { // Relative error
DVector diff;
ytest_truth.Subtract(ytest_predict, diff);
perf = diff.Norm2()/ytest_truth.Norm2();
}
else if (NumClasses == 2) { // Accuracy
double *y1 = ytest_truth.GetPointer();
double *y2 = ytest_predict.GetPointer();
for (long i = 0; i < n; i++) {
perf += y1[i]*y2[i]>0 ? 1.0:0.0;
}
perf = perf/n * 100.0;
}
return perf;
}示例2: ConvertYtrain
//--------------------------------------------------------------------------
void ConvertYtrain(const DVector &ytrain, DMatrix &Ytrain, int NumClasses) {
Ytrain.Init(ytrain.GetN(), NumClasses);
// Lingfei: the y label is supposed to start from 0.
for (int i = 0; i < NumClasses; i++) {
DVector y = ytrain;
double *my = y.GetPointer();
for (long j = 0; j < y.GetN(); j++) {
my[j] = ((int)my[j])==i ? 1.0 : -1.0;
}
Ytrain.SetColumn(i, y);
}
}