internal static void PruneAfterConnection(PatternRecorderFrequent fRecorder, MiningParams param, Depth depth)
{
if (!param.MineFrequent && (param.MineClosed || param.MineMaximal))
{
PruneCannotBeClosed(fRecorder, param, depth);
}
PruneCannotBeExtended(fRecorder, param, depth);
}
private static void PruneCannotBeExtended(PatternRecorderFrequent fRecorder, MiningParams param, Depth depth)
{
var fDi = fRecorder.GetFrequentsAtDepth(depth + 1);
foreach (var fpt in fDi)
{
fpt.PruneAfterConnection(param, depth);
}
fRecorder.RemoveCannotBeExtended(depth + 1);
}
private static void PruneCannotBeClosed(PatternRecorderFrequent fRecorder, MiningParams param, Depth depth)
{
if (param.MineFrequent || !(param.MineClosed || param.MineMaximal))
{
return;
}
var rDi = fRecorder.GetFanout1FrequentsAtDepth(depth);
rDi.Sort();
var dic = new Dictionary <NodeSymbol, List <PatternTree> >();
foreach (var t in rDi)
{
if (t.Is2Pattern)
{
continue;
}
var key = t.FirstSymbol + "," + t.SecondSymbol;
if (!dic.ContainsKey(key))
{
dic.Add(key, new List <PatternTree>());
}
dic[key].Add(t);
}
foreach (var fpSet in dic)
{
var keysRedundant = new HashSet <string>();
for (var i = 0; i < fpSet.Value.Count; i++)
{
var ti = fpSet.Value[i];
for (var j = 0; j < fpSet.Value.Count; j++)
{
var tj = fpSet.Value[j];
if (i == j)
{
continue;
}
if (ti.Size >= tj.Size || ti.TransactionSupport != tj.TransactionSupport || ti.RootSupport != tj.RootSupport)
{
continue;
}
if (!ti.IsSuperPattern(tj, depth))
{
continue;
}
var maxDif = (param.SupportType == SupportType.Transaction)
? param.ThresholdTransaction : param.ThresholdRoot;
if (ti.NumberOfRightMostOcc - tj.NumberOfRightMostOcc >= maxDif)
{
continue;
}
keysRedundant.Add(ti.PreorderString);
break;
}
}
fRecorder.RemoveRedundantForClosed(keysRedundant);
Debug.WriteLine("Depth:{0} RemoveRedundantForClosed Number={1}", depth, keysRedundant.Count);
}
}
