C++ (Cpp) crossValidate Examples

Example #1

File: GNaiveBayes.cpp Project: BaskWind/waffles

void GNaiveBayes::autoTune(GMatrix& features, GMatrix& labels)
{
	// Find the best ess value
	double bestEss = 0.0;
	double bestErr = 1e308;
	for(double i = 0.0; i < 8; i += 0.25)
	{
		m_equivalentSampleSize = i;
		double d = crossValidate(features, labels, 2);
		if(d < bestErr)
		{
			bestErr = d;
			bestEss = i;
		}
		else if(i >= 2.0)
			break;
	}

	// Set the best values
	m_equivalentSampleSize = bestEss;
}

Example #2

File: GNaiveInstance.cpp Project: skn123/waffles

void GNaiveInstance::autoTune(GMatrix& features, GMatrix& labels)
{
	// Find the best ess value
	size_t bestK = 0;
	double bestErr = 1e308;
	size_t cap = size_t(floor(sqrt(double(features.rows()))));
	for(size_t i = 2; i < cap; i = size_t(i * 1.5))
	{
		m_nNeighbors = i;
		double d = crossValidate(features, labels, 2);
		if(d < bestErr)
		{
			bestErr = d;
			bestK = i;
		}
		else if(i >= 15)
			break;
	}

	// Set the best values
	m_nNeighbors = bestK;
}