public override double GetElementFactor(string term, SpaceDocumentModel document)
{
if (!IsEnabled)
{
return(1);
}
TokenDictionary docDict = document.GetTerms(true, true);
Double TF = docDict.GetTokenFrequency(term);
switch (computation)
{
case TFComputation.modifiedTF:
if (!index.ContainsKey(term))
{
return(0);
}
Double Tt = index[term]; // training_terms.GetTokenFrequency(term);
Double length_d = docDict.Count; //.GetTokenCount();
Double mTF_above = TF * Math.Log(SqrTc / Tt);
Double mTF_below_2nd = (length_d * length_d) / SqrTc;
Double mTF_below = Math.Log(docDict.GetSumSquareFrequencies() * mTF_below_2nd);
return(mTF_above / mTF_below);
break;
}
Double divisor = GetDivisor(docDict);
//if (TFN_index.ContainsKey(document))
//{
// divisor = TFN_index[document];
//}
//else
//{
// divisor
//}
switch (computation)
{
default:
case TFComputation.normal:
return(TF / divisor);
break;
case TFComputation.squareRooted:
return(Math.Sqrt(TF / divisor));
break;
case TFComputation.glasgow:
return(Math.Log(TF + 1) / divisor);
break;
}
}