public void TestSweetSpotTf()
{
SweetSpotSimilarity ss = new SweetSpotSimilarity();
TFIDFSimilarity d = new DefaultSimilarity();
TFIDFSimilarity s = ss;
// tf equal
ss.SetBaselineTfFactors(0.0f, 0.0f);
for (int i = 1; i < 1000; i++)
{
assertEquals("tf: i=" + i,
d.Tf(i), s.Tf(i), 0.0f);
}
// tf higher
ss.SetBaselineTfFactors(1.0f, 0.0f);
for (int i = 1; i < 1000; i++)
{
assertTrue("tf: i=" + i + " : d=" + d.Tf(i) +
" < s=" + s.Tf(i),
d.Tf(i) < s.Tf(i));
}
// tf flat
ss.SetBaselineTfFactors(1.0f, 6.0f);
for (int i = 1; i <= 6; i++)
{
assertEquals("tf flat1: i=" + i, 1.0f, s.Tf(i), 0.0f);
}
ss.SetBaselineTfFactors(2.0f, 6.0f);
for (int i = 1; i <= 6; i++)
{
assertEquals("tf flat2: i=" + i, 2.0f, s.Tf(i), 0.0f);
}
for (int i = 6; i <= 1000; i++)
{
assertTrue("tf: i=" + i + " : s=" + s.Tf(i) +
" < d=" + d.Tf(i),
s.Tf(i) < d.Tf(i));
}
// stupidity
assertEquals("tf zero", 0.0f, s.Tf(0), 0.0f);
}
public Hashtable GetVector2()
{
StringBuilder sb = new StringBuilder();
string indexPath = AppDomain.CurrentDomain.BaseDirectory.ToString() + "\\App_Data\\";
DirectoryInfo dirInfo = new DirectoryInfo(indexPath);
FSDirectory dir = FSDirectory.Open(dirInfo);
Hashtable ht = new Hashtable();
Hashtable ht2 = new Hashtable();
IndexReader ir = IndexReader.Open(dir, false);
DefaultSimilarity similarity = new DefaultSimilarity();
string[] label = null;
int[] freq = null;
foreach (var obj in ir.GetTermFreqVectors(1))
{
label = obj.GetTerms();
freq = obj.GetTermFrequencies();
}
Response.Write("s1<br>");
for (int i = 0; i <= label.Length - 1; i++)
{
ht.Add(label[i], freq[i]);
if (!TotalNoun.Contains(label[i]))
{
TotalNoun.Add(label[i]);
}
}
foreach (DictionaryEntry obj in ht)
{
float tf = similarity.Tf(Convert.ToInt32(obj.Value));
Term t = new Term("Text", obj.Key.ToString());
float idf = similarity.Idf(ir.DocFreq(t), ir.NumDocs());
float tfidf = tf * idf;
sb.AppendFormat(string.Format("label:{0} freq:{1}<BR>", obj.Key, obj.Value));
sb.AppendFormat(string.Format("TF:{0}<br>", similarity.Tf(Convert.ToInt32(obj.Value))));
sb.AppendFormat(string.Format("IDF:{0}<br>", similarity.Idf(ir.DocFreq(t), ir.NumDocs())));
sb.AppendFormat(string.Format("TF-IDF:{0}<br>", tfidf));
ht2.Add(obj.Key, tfidf);
}
Response.Write(sb.ToString());
return(ht2);
}