public double CalculateDistance(ITermWeightRepresentation termWeightRepresentation,
TermsCollection termsCollection)
{
double sum = 0;
foreach (string term in termsCollection.Terms)
{
sum += Math.Pow(termWeightRepresentation.TermWeight(term), 2);
}
return Math.Sqrt(sum);
}
public double CalculateProbability(ITermWeightRepresentation queryRepresentation,
ITermWeightRepresentation documentRepresentation,
TermsCollection termsCollection)
{
double queryDistance = _distanceCalculator.CalculateDistance(queryRepresentation, termsCollection);
double documentDistance = _distanceCalculator.CalculateDistance(documentRepresentation, termsCollection);
double sum = 0;
foreach (string term in termsCollection.Terms)
{
sum += queryRepresentation.TermWeight(term)*documentRepresentation.TermWeight(term);
}
return sum/(queryDistance*documentDistance);
}
/// <summary>
///
/// </summary>
/// <param name="termWeightRepresentation">should be instance of <see cref="Tf"/></param>
/// <param name="idf"></param>
public TfIdf(ITermWeightRepresentation termWeightRepresentation, IIdf idf)
{
_termWeightRepresentation = termWeightRepresentation;
_idf = idf;
}