private CentroidVector transform2CentroidVector(DocumentVector documentVector)
{
CentroidVector centroid = new CentroidVector();
foreach (double weight in documentVector.getWeightVector())
{
centroid.addWeight(weight);
}
return(centroid);
}
private CentroidVector getClosestCentroid(List <CentroidVector> centroids, DocumentVector documentVector)
{
double minDistance = Double.MaxValue;
CentroidVector minCentroidVector = null;
foreach (CentroidVector centroid in centroids)
{
double currentDistance = cosSimilarity(documentVector, centroid);
if (minDistance > currentDistance)
{
minDistance = currentDistance;
minCentroidVector = centroid;
}
}
return(minCentroidVector);
}
private void fillClusters(List <DocumentVector> vectors, List <CentroidVector> centroids)
{
foreach (DocumentVector documentVector in vectors)
{
double minDistance = Double.MaxValue;
CentroidVector minDistanceCentroid = null; // TODO
foreach (CentroidVector centroidVector in centroids)
{
double currentDistance = cosSimilarity(documentVector, centroidVector);
if (currentDistance < minDistance)
{
minDistance = currentDistance;
minDistanceCentroid = centroidVector;
}
}
minDistanceCentroid.addVector(documentVector);
}
}
private List <CentroidVector> randomCentroidVectorList2(List <DocumentVector> vectors)
{
List <CentroidVector> centroids = new List <CentroidVector>();
Random randomSeed = new Random(1);
for (int index = 0; index < k; index++)
{
int randomIndex = randomSeed.Next(vectors.Count);
DocumentVector documentVector = vectors[randomIndex];
CentroidVector centroid = new CentroidVector();
foreach (double weight in documentVector.getWeightVector())
{
centroid.addWeight(weight);
}
centroids.Add(centroid);
}
return(centroids);
}
private List <CentroidVector> randomCentroidVectorList(List <DocumentVector> vectors)
{
if (vectors.Count < k)
{
Console.WriteLine("Sorry, no more vector to random.");
return(null);
}
List <CentroidVector> centroids = new List <CentroidVector>();
List <int> indexs = CommonUtils.randomSetByFloyd(0, vectors.Count, k);
foreach (int index in indexs)
{
DocumentVector documentVector = vectors[index];
CentroidVector centroid = new CentroidVector();
foreach (double weight in documentVector.getWeightVector())
{
centroid.addWeight(weight);
}
centroids.Add(centroid);
}
return(centroids);
}
