public CityCluster(List<CityNodeData> Cities, List<CityNodeData> AllCities, CostMatrix costMatrix)
{
_containedCities = new List<CityNodeData>(Cities);
_allCities = new List<CityNodeData>(AllCities);
_costMatrix = costMatrix;
_cityEntryPoint = -1;
_cityExitPoint = -1;
_incomingEdgesSortedByDistance = new List<int>();
_outgoingEdgesSortedByDistance = new List<int>();
_incomingEdgesByCitySortedByDistance = new Dictionary<int, List<int>>();
_outgoingEdgesByCitySortedByDistance = new Dictionary<int, List<int>>();
foreach (CityNodeData innerCity in _containedCities)
{
int innerCityId = innerCity.CityId;
foreach (CityNodeData outerCity in AllCities)
{
if (!_containedCities.Contains(outerCity))
{
int outerCityId = outerCity.CityId;
if (!_incomingEdgesByCitySortedByDistance.ContainsKey(outerCityId))
{
_incomingEdgesByCitySortedByDistance.Add(outerCityId, new List<int>());
}
if (!_outgoingEdgesByCitySortedByDistance.ContainsKey(outerCityId))
{
_outgoingEdgesByCitySortedByDistance.Add(outerCityId, new List<int>());
}
int incomingId = costMatrix.EdgeId(outerCityId, innerCityId);
int outgoingId = costMatrix.EdgeId(innerCityId, outerCityId);
_incomingEdgesSortedByDistance.Add(incomingId);
_incomingEdgesByCitySortedByDistance[outerCityId].Add(incomingId);
_outgoingEdgesSortedByDistance.Add(outgoingId);
_outgoingEdgesByCitySortedByDistance[outerCityId].Add(outgoingId);
}
}
}
_incomingEdgesSortedByDistance.Sort((a, b) =>
costMatrix.CostAtEdgeId(a).CompareTo(costMatrix.CostAtEdgeId(b))
);
_outgoingEdgesSortedByDistance.Sort((a, b) =>
costMatrix.CostAtEdgeId(a).CompareTo(costMatrix.CostAtEdgeId(b)));
ContainedCityIds = new List<int>();
foreach (CityNodeData city in _containedCities)
{
ContainedCityIds.Add(city.CityId);
}
}
public double SolveExternalClusters(CostMatrix costMatrix, List<CityNodeData> CityData,
List<CityCluster> cityClusters, Dictionary<int, CityCluster> cityToClusterItsIn,
out List<int> interNodeEdges)
{
int startingEdge = -1;
foreach (int i in costMatrix.AllEdgesSortedByDistance)
{
KeyValuePair<int, int> coords = costMatrix.EdgeCoords(i);
if (!cityToClusterItsIn[coords.Key].Equals(cityToClusterItsIn[coords.Value]))
{
startingEdge = i;
break;
}
}
KeyValuePair<int, int> curCoords = costMatrix.EdgeCoords(startingEdge);
CityCluster curFromCluster = cityToClusterItsIn[curCoords.Key];
List<int> visitedCities = new List<int>();
List<CityCluster> clustersVisitedInOrder = new List<CityCluster>();
interNodeEdges = new List<int>();
clustersVisitedInOrder.Add(cityToClusterItsIn[curCoords.Key]);
visitedCities.AddRange(cityToClusterItsIn[curCoords.Key].ContainedCityIds);
cityToClusterItsIn[curCoords.Value].IncomingFromEdge(startingEdge);
cityToClusterItsIn[curCoords.Key].OutgoingOnEdge(startingEdge);
interNodeEdges.Add(startingEdge);
while (interNodeEdges.Count < cityClusters.Count - 1)
{
curFromCluster = cityToClusterItsIn[curCoords.Value];
int newEdgeId = curFromCluster.GetShortestValidOutgoingEdgeIgnoringCities(visitedCities);
curCoords = costMatrix.EdgeCoords(newEdgeId);
cityToClusterItsIn[curCoords.Value].IncomingFromEdge(newEdgeId);
cityToClusterItsIn[curCoords.Value].OutgoingOnEdge(newEdgeId);
clustersVisitedInOrder.Add(curFromCluster);
visitedCities.AddRange(curFromCluster.ContainedCityIds);
interNodeEdges.Add(newEdgeId);
}
CityCluster end = cityToClusterItsIn[curCoords.Value];
CityCluster start = clustersVisitedInOrder[0];
int lastEdge = CityCluster.ShortedValidEdgeBetweenClusters(end, start);
interNodeEdges.Add(lastEdge);
_interNodeEdges = interNodeEdges;
double retVal = 0;
foreach (int edge in interNodeEdges)
{
retVal += costMatrix.CostAtEdgeId(edge);
}
return retVal;
}
public void DoClusters(out CostMatrix CostMatrix, out List<CityNodeData> CityData,
out List<CityCluster> CityClusters, out Dictionary<int, CityCluster> CityToClusterItsIn,
out Dictionary<int, int> SizeClusterToNumberOfThatSize)
{
CostMatrix = new CostMatrix(Cities);
_costMatrix = CostMatrix;
Stopwatch clusterWatch = new Stopwatch();
clusterWatch.Start();
CityData = new List<CityNodeData>();
_cityNodes = CityData;
for (int i = 0; i < CostMatrix.Size; i++)
{
CityData.Add(new CityNodeData(i, CostMatrix, Cities));
}
//Clustering
double threshold = CostMatrix.DistanceRange * _clusterPercent;
_threshold = (float)threshold;
List<CityNodeData> citiesSortedByNumberUnderThreshold = new List<CityNodeData>(CityData);
citiesSortedByNumberUnderThreshold.Sort((a, b) =>
(a.AverageWorstDistanceOfBelowThreshold(threshold).CompareTo(
b.AverageWorstDistanceOfBelowThreshold(threshold))));
List<List<CityNodeData>> finalClusters = new List<List<CityNodeData>>();
List<CityNodeData> visited = new List<CityNodeData>(CityData);
Dictionary<CityNodeData, int> clusterAssignment = new Dictionary<CityNodeData, int>();
foreach (CityNodeData c in visited)
{
clusterAssignment.Add(c, -1);
}
while (citiesSortedByNumberUnderThreshold.Count > 0)
{
List<CityNodeData> curCluster = new List<CityNodeData>();
CityNodeData cur = citiesSortedByNumberUnderThreshold[0];
clusterAssignment[cur] = finalClusters.Count;
citiesSortedByNumberUnderThreshold.RemoveAt(0);
visited.Remove(cur);
curCluster.Add(cur);
for (int i = 0; i < cur.SortedWorstDistance.Count; i++)
{
bool canAdd = true;
CityNodeData curCloseCheck = CityData[cur.SortedWorstDistance[i].CityId];
if (!visited.Contains(curCloseCheck))
{
continue;
}
foreach (CityNodeData inCluster in curCluster)
{
double worstDistance = CostMatrix.WorstDistanceBetween(inCluster.CityId, curCloseCheck.CityId);
if (worstDistance > threshold)
{
canAdd = false;
break;
}
}
if (canAdd)
{
curCluster.Add(curCloseCheck);
visited.Remove(curCloseCheck);
citiesSortedByNumberUnderThreshold.Remove(curCloseCheck);
}
}
finalClusters.Add(curCluster);
}
clusterWatch.Stop();
Console.WriteLine("SAVED: " + (CostMatrix.Size - finalClusters.Count));
_storedClusters = finalClusters;
CityClusters = new List<CityCluster>();
CityToClusterItsIn = new Dictionary<int, CityCluster>();
SizeClusterToNumberOfThatSize = new Dictionary<int, int>();
foreach (List<CityNodeData> clust in finalClusters)
{
CityCluster actualCluster = new CityCluster(clust, CityData, CostMatrix);
CityClusters.Add(actualCluster);
foreach (int city in actualCluster.ContainedCityIds)
{
CityToClusterItsIn.Add(city, actualCluster);
}
if (!SizeClusterToNumberOfThatSize.ContainsKey(clust.Count))
{
SizeClusterToNumberOfThatSize.Add(clust.Count, 0);
}
SizeClusterToNumberOfThatSize[clust.Count] =
SizeClusterToNumberOfThatSize[clust.Count] + 1;
}
}
private TSPSolution Solve(CostMatrix costMatrix, List<CityNodeData> CityData,
List<CityCluster> cityClusters, Dictionary<int, CityCluster> cityToClusterItsIn,
List<int> interNodeEdges)
{
List<int> allEdges = new List<int>();
ArrayList sol = new ArrayList();
foreach (int edge in interNodeEdges)
{
KeyValuePair<int, int> coords = costMatrix.EdgeCoords(edge);
CityCluster target = cityToClusterItsIn[coords.Value];
allEdges.Add(edge);
List<int> edgesSolved = target.GreedySolveEdges();
if (edgesSolved.Count == 0)
{
sol.Add(Cities[target.ContainedCityIds[0]]);
}
else
{
for (int i = 0; i < edgesSolved.Count; i++)
{
int curEdge = edgesSolved[i];
KeyValuePair<int, int> innerCoords = costMatrix.EdgeCoords(curEdge);
if (i == 0)
{
sol.Add(Cities[innerCoords.Key]);
}
sol.Add(Cities[innerCoords.Value]);
allEdges.Add(curEdge);
}
}
}
return new TSPSolution(sol);
}