public double ReturnClusterPairDistance(ClusterPair clusterPair)
{
if (_distanceMatrix.ContainsKey(clusterPair))
{
return(_distanceMatrix[clusterPair]);
}
else
{
return(_distanceMatrix[new ClusterPair(clusterPair.Cluster2, clusterPair.Cluster1)]);
}
}
public void RemoveClusterPair(ClusterPair clusterPair)
{
if (_distanceMatrix.ContainsKey(clusterPair))
{
_distanceMatrix.TryRemove(clusterPair, out _);
}
else
{
_distanceMatrix.TryRemove(new ClusterPair(clusterPair.Cluster2, clusterPair.Cluster1), out _);
}
}
private IEnumerable <ClusterPair> _ClusterPairCollection()
{
ClusterPair clusterPair;
for (int i = 0; i < _clusters.Count(); i++)
{
for (int j = i + 1; j < _clusters.Count(); j++)
{
clusterPair = new ClusterPair();
clusterPair.Cluster1 = _clusters.GetCluster(i);
clusterPair.Cluster2 = _clusters.GetCluster(j);
yield return(clusterPair);
}
}
}
public ClusterPair GetClosestClusterPair()
{
double minDistance = double.MaxValue;
ClusterPair closestClusterPair = new ClusterPair();
foreach (var item in _distanceMatrix)
{
if (item.Value < minDistance)
{
minDistance = item.Value;
closestClusterPair = item.Key;
}
}
return(closestClusterPair);
}
private void BuildHierarchicalClustering(int indexNewCluster, ClusterDistanceStrategy strategy, int k)
{
ClusterPair closestClusterPair = this._GetClosestClusterPairInDissimilarityMatrix();
// create a new cluster by merge the closest cluster pair
Cluster newCluster = new Cluster();
newCluster.AddSubCluster(closestClusterPair.Cluster1);
newCluster.AddSubCluster(closestClusterPair.Cluster2);
newCluster.Id = indexNewCluster;
newCluster.UpdateTotalQuantityOfPatterns(); //update the total quantity of patterns of the new cluster (this quantity is used by UPGMA clustering strategy)
_clusters.RemoveCluster(closestClusterPair.Cluster1);
_clusters.RemoveCluster(closestClusterPair.Cluster2);
_UpdateDissimilarityMatrix(newCluster, strategy);
//add the new cluster to clustering
_clusters.AddCluster(newCluster);
// recursive call of this method while there is more than 1 cluster (k>2) in the clustering
if (_clusters.Count() > k)
{
this.BuildHierarchicalClustering(indexNewCluster + 1, strategy, k);
}
}
public void AddClusterPairAndDistance(ClusterPair clusterPair, double distance)
{
_distanceMatrix.TryAdd(clusterPair, distance);
}