public FPTree(IInputDatabaseHelper inDatabaseHelper, float minSup)
: this()
{
minimumSupport = minSup;
inputDatabaseHelper = inDatabaseHelper;
float temp = minimumSupport * inputDatabaseHelper.TotalTransactionNumber;
minimumSupportCount = (int)temp;
if (temp % 1 != 0)
{
minimumSupportCount++;
}
CalculateFrequentItems();
frequentItems = frequentItems.OrderByDescending(x => x.SupportCount).ToList();// Xong B1.1
inputDatabaseHelper.OpenDatabaseConnection();
List <string> aTransaction = new List <string>();
do
{
aTransaction = inputDatabaseHelper.GetNextTransaction();
if (aTransaction.Exists(x => x != "y" && x != "?"))
{
continue;
}
InsertTransaction(aTransaction);
}while (aTransaction.Count > 0);
inputDatabaseHelper.CloseDatabaseConnection();
}
public int CreateFPTreeAndGenerateFrequentItemsets(
IInputDatabaseHelper _inputHelper, IOutputDatabaseHelper _outHelper, float minSup)
{
outputDatabaseHelper = _outHelper;
var watch = System.Diagnostics.Stopwatch.StartNew();
FPTree _fpTree = new FPTree(_inputHelper, minSup);
fpTree = _fpTree;
int totalFrequentItemSets = GenerateFrequentItemSets();
watch.Stop();
outputDatabaseHelper.WriteAggregatedResult(minSup, totalFrequentItemSets, (double)watch.ElapsedMilliseconds);
return(totalFrequentItemSets);
}
public FPTree(IInputDatabaseHelper inDatabaseHelper, float minSup)
: this()
{
minimumSupport = minSup;
inputDatabaseHelper = inDatabaseHelper;
minimumSupportCount = (int)(minimumSupport * (float)inputDatabaseHelper.TotalTransactionNumber);
CalculateFrequentItems();
frequentItems = frequentItems.OrderByDescending(x => x.SupportCount).ToList();
inputDatabaseHelper.OpenDatabaseConnection();
List <string> aTransaction = new List <string>();
do
{
aTransaction = inputDatabaseHelper.GetNextTransaction();
InsertTransaction(aTransaction);
}while (aTransaction.Count > 0);
inputDatabaseHelper.CloseDatabaseConnection();
}
public AprioriAlgorithm(IInputDatabaseHelper _inDatabaseHelper, IOutputDatabaseHelper _outDatabaseHelper, int _minimumSupportCount)
: this(_inDatabaseHelper, _outDatabaseHelper)
{
MinimumSupportCount = _minimumSupportCount;
}
//constructor
public AprioriAlgorithm(IInputDatabaseHelper _inDatabaseHelper, IOutputDatabaseHelper _outDatabaseHelper)
{
inputDatabaseHelper = _inDatabaseHelper;
outputDatabaseHelper = _outDatabaseHelper;
MinimumSupport = 0f;
}
