Hello Nicolas, I am sure you mean IR (Information Retrieval) Model. Lucene implements a Vector Space Model with integrated Boolean Model. This means the Boolean model is integrated with a Boolean query language but mapped into the Vector Space. Therefore you have ranking even though the traditional Boolean model does not support this. Cosine similarity is used to measure similarity between documents and the query. You can find this in a very long dicussion here when you search the archive...
Karl > hy , > i have 2 theorycal questions : > > i searched in the mailing list the R.I. model implemented in Lucene , > but no precise answer. > > 1) What is the R.I model implemented in Lucene ? (ex: Boolean Model, > Vector Model,Probabilist Model, etc... ) > > 2) What is the theory Similarity function implemented in Lucene > (Euclidian, Cosine, Jaccard, Dice) > > (why this important informations is not in the Lucene Web site or in the > faq ? ) > -- +++ GMX - die erste Adresse f�r Mail, Message, More +++ Bis 31.1.: TopMail + Digicam f�r nur 29 EUR http://www.gmx.net/topmail --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
