Dear Partick, I had the same problem with MoreLikeThis function. After briefly reading and analyzing the source code of moreLikeThis function in solr, I conducted:
MoreLikeThis uses term vectors to ranks all the terms from a document by its frequency. According to its ranking, it will start to generate queries, artificially, and search for documents. So, moreLikeThis will retrieve related documents by artificially generating queries based on most frequent terms. There's a big problem with "most frequent terms" from documents. Most frequent words are usually meaningless, or so called function words, or, people from Information Retrieval like to call them stopwords. However, ignoring technical problems of implementation of moreLikeThis function, this approach is very dangerous, since queries are generated artificially based on a given document. Writting queries for retrieving a document is a human task, and it assumes some knowledge (user knows what document he wants). I advice to use others approaches, depending on your expectation. For example, you can extract similar documents just by searching for documents with similar title (more like this doesn't work in this case). I hope it helps, Best Regards, Vitalie Scurtu --- On Wed, 11/26/08, Plaatje, Patrick <[EMAIL PROTECTED]> wrote: From: Plaatje, Patrick <[EMAIL PROTECTED]> Subject: RE: Keyword extraction To: solr-user@lucene.apache.org Date: Wednesday, November 26, 2008, 10:52 AM Hi All, as an addition to my previous post, no interestingTerms are returned when i execute the folowing url: http://localhost:8080/solr/select/?q=id=18477975&mlt.fl=text&mlt.interes tingTerms=list&mlt=true&mlt.match.include=true I get a moreLikeThis list though, any thoughts? Best, Patrick
