private double cossim_denumerator(TermInDoc item)
{
double sum = 0;
foreach (var item2 in _tf_all_docs[item._doc_id])
{
sum += Math.Pow(tf_idf(item._doc_id, item2.Key),2);
}
return Math.Sqrt(sum * _num_terms_in_query);
}
private double cossim_numerator(TermInDoc item)
{
double sum = 0;
foreach (string term in _ExistingTerms)
{
sum += tf_idf(item._doc_id, term);
if (is_in_headline(item._doc_id, term))
sum *= 2;
}
if (sum == 0)
Console.WriteLine();
return sum;
}
// using the psaudo LRU idea, when a term is already in cache, promote it by a flag is_popular
private void promote_queue(string key, TermInDoc term)
{
// needs to promote
cache[key].Add(term);
main_dic[key].is_popular = true;
}
// adding to the inverted files dictionary
private void add_to_dic(string p, TermInDoc termInDoc)
{
Posting post = new Posting();
main_dic.TryAdd(p, post);
}
// add term to the cache
private void add_to_cache(string key, TermInDoc term)
{
ConcurrentBag<TermInDoc> list = new ConcurrentBag<TermInDoc>();
list.Add(term);
if (queue.Count < _cache_size)
{
queue.Enqueue(key);
}
else
{
write2(_numOfTermsInPosting);
queue.Enqueue(key);
}
cache.TryAdd(key, list);
}