/// <summary>
/// pagerank score for each tag equation 4 in the paper
/// </summary>
/// <param name="neighbours"></param>
private void ComputeTagSignificance(List<Question> neighbours)
{
var restartprob = Vector.Build.Dense(candidates.Count);
TranslationMatrix = new DenseMatrix(candidates.Count, candidates.Count);
foreach (var neighbour in neighbours)
{
foreach (var tag in neighbour.RelatedTags)
{
if (tagFrequency.ContainsKey(tag))
tagFrequency[tag]++;
else
tagFrequency.Add(tag, 1);
}
}
int i = 0;
foreach (var candidate in candidates)
{
restartprob[i++] = tagFrequency[candidate.Key];
}
restartprob = restartprob.Normalize(1);
i = 0;
for (int rowindex = 0; rowindex < TranslationMatrix.RowCount; rowindex++)
for (int columnindex = 0; columnindex < TranslationMatrix.ColumnCount; columnindex++)
{
TranslationMatrix[rowindex, columnindex] += tagSim[rowindex, columnindex];
}
TranslationMatrix = DenseMatrix.OfMatrix(TranslationMatrix.NormalizeColumns(1));
tagsignificance = Utils.PageRank(TranslationMatrix, restartprob);
}