I think you might find BM25 useful:
http://nlp.uned.es/~jperezi/Lucene-BM25/
<http://nlp.uned.es/%7Ejperezi/Lucene-BM25/>
https://issues.apache.org/jira/browse/LUCENE-2091
Other than that, CLucene should follow Lucene's API especially in those
areas...
Itamar.
On 21/10/2010 8:41 PM, Šplíchal Jiří wrote:
Hi,
I have to change clucene scoring in the way that the number of
documents that contain a certain term
does not influence the final score when querying documents using this
term.
In other words I have to make the score of a document independent of
content of the index -- it should
be influenced only by the document itself and the query.
I understood that to achieve this it is enough to overwrite the
Similarity and make the inverse document
frequency - idf constant. This seems to work fine. But I noticed that
the base class Similarity contains two other
idf() functions which are not virtual -- especially the float_t
Similarity::idf(Term* term, Searcher* searcher)
which retrieves the document frequency and calls the virtual idf()
function to compute the result.
I was wondering whether we could make those two other functions also
virtual so that I could save retrieving
the document frequency at all. I could just return the constant value.
Jiri
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