lucene score formula
--------------------
Key: LUCENENET-111
URL: https://issues.apache.org/jira/browse/LUCENENET-111
Project: Lucene.Net
Issue Type: Bug
Environment: ASP.NET C#
Reporter: immanouel
I´m working with lucene. net in C# and i, being quite confuse, have a question :
First of all i created an IndexWriter code to insert text on lucene, then
an indexsearcher ...
here´s the index write code:
/........................................................................................................
IndexWriter writer = new IndexWriter(sIndexPath, new
StandardAnalyzer(), false);
Document doc = new Document();
doc.Add(new Field("title", sHeader, Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.Add(new Field("link", sType, Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.Add(new Field("content", sContent, Field.Store.YES,
Field.Index.TOKENIZED));
writer.AddDocument(doc);
writer.Optimize();
writer.Close();
/......................................................................................................
here´s the IndexSearcher code:
(As you can see there´s an - explanation - code output)
//....................................................................................................................................
IndexSearcher searcher = new IndexSearcher(IndexLocation());
QueryParser oParser = new QueryParser("content", new StandardAnalyzer());
string sSearchQuery = TextBox1.Text;
Hits oHitColl = searcher.Search(oParser.Parse(sSearchQuery));
for (int i = 0; i < oHitColl.Length(); i++)
{
Explanation explanation = searcher.Explain(query,
oHitColl.Id(i));//generate explanation of single document for query
// Document oDoc = oHitColl.Doc(i);
string conteudo = oDoc.Get("content");
if (conteudo != null)
{
Label1.Text = Label1.Text + explanation.ToString() + "<br>";//output
explanation
Label2.Text = Label2.Text + "</p>-------------<br>";
}
//.............................As you can see the code is nothing
special..............................................
Everything went well, except that i don´t understand something in the output...
:
1,356585 = fieldWeight(content:açores in 448), product of: 1 =
tf(termFreq(content:açores)=1) 2,713169 = idf(docFreq=85) 0,5 =
fieldNorm(field=content, doc=448)
----------
0,4239327 = fieldWeight(content:açores in 253), product of: 2 =
tf(termFreq(content:açores)=4) 2,713169 = idf(docFreq=85) 0,078125 =
fieldNorm(field=content, doc=253)
----------
0,4153675 = fieldWeight(content:açores in 125), product of: 2,44949 =
tf(termFreq(content:açores)=6) 2,713169 = idf(docFreq=85) 0,0625 =
fieldNorm(field=content, doc=125)
----------
0,3791769 = fieldWeight(content:açores in 210), product of: 2,236068 =
tf(termFreq(content:açores)=5) 2,713169 = idf(docFreq=85) 0,0625 =
fieldNorm(field=content, doc=210)
----------
0,3671364 = fieldWeight(content:açores in 259), product of: 1,732051 =
tf(termFreq(content:açores)=3) 2,713169 = idf(docFreq=85) 0,078125 =
fieldNorm(field=content, doc=259)
----------
0,3634466 = fieldWeight(content:açores in 95), product of: 2,44949 =
tf(termFreq(content:açores)=6) 2,713169 = idf(docFreq=85) 0,0546875 =
fieldNorm(field=content, doc=95)
etc..
So here goes the question:
shouldn´t the output order be based on the termFreq ?? how come termfrequecy =
1 be in the top order list?
Shouldn´t the (termFreq(content:açores)=1) be the last (on the list) and
(termFreq(content:açores)=6) at top (of the list)?
Am i doing something wrong? Is there something about lucene score formula that
i should know?
Thanks!
PS - Please response!!
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