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FPGrowth.cs
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FPGrowth.cs
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using _24_1A.DAL.DAO;
using _24_1A.DAL.Gateway.Interface;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _24_1A
{
class FPGrowth
{
FPTree fpTree;
IOutputDatabaseHelper outputDatabaseHelper;
public FPGrowth()
{
fpTree = null;
outputDatabaseHelper = null;
}
public FPGrowth(FPTree tree, IOutputDatabaseHelper outDatabaseHelper)
: this()
{
fpTree = tree;
outputDatabaseHelper = outDatabaseHelper;
}
public int GenerateFrequentItemSets()
{
List<Item> frequentItems = fpTree.FrequentItems;
int totalFrequentItemSets = frequentItems.Count;
foreach (Item anItem in frequentItems)
{
ItemSet anItemSet = new ItemSet();
anItemSet.AddItem(anItem);
totalFrequentItemSets += Mine(fpTree, anItemSet);
Console.WriteLine(totalFrequentItemSets + " itemsets for " + anItem.Symbol);
}
Console.WriteLine(totalFrequentItemSets);
return totalFrequentItemSets;
}
private int Mine(FPTree fpTree, ItemSet anItemSet)
{
int minedItemSets = 0;
FPTree projectedTree;
projectedTree = fpTree.Project(anItemSet.GetLastItem());
minedItemSets = projectedTree.FrequentItems.Count;
foreach (Item anItem in projectedTree.FrequentItems)
{
ItemSet nextItemSet = anItemSet.Clone();
nextItemSet.AddItem(anItem);
minedItemSets += Mine(projectedTree, nextItemSet);
}
return minedItemSets;
}
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;
}
}
}