Hi, Thanks for your reply.
I can use the getTermFreqVector() on Index Reader and get it. But I am wondering whats the API which has to be used to find the similarity between 2 such vectors which would give a score (doc-doc similairty in essence). Thanks. Grant Ingersoll-6 wrote: > > Hi, > > > On Aug 16, 2007, at 2:20 PM, Lokeya wrote: > >> >> Hi All, >> >> I have the following set up: a) Indexed set of docs. b) Ran 1st >> query and >> got tops docs c) Fetched the id's from that and stored in a data >> structure. >> d) Ran 2nd query , got top docs , fetched id's and stored in a data >> structure. >> >> Now i have 2 sets of doc ids (set 1) and (set 1). >> >> I want to find out the document content similarity between these 2 >> sets(just >> using doc ids information which i have). >> > > Not sure what you mean here. What do the doc ids have to do with the > content? > >> Qn 1: Is it possible using any lucene api's. In that case can you >> point me >> to the appropriate API's. I did a search at >> :http://lucene.zones.apache.org:8080/hudson/job/Lucene-Nightly/ >> javadoc/index.html >> But couldn't find anything. >> > > It is possible if you use Term Vectors (see > IndexReader.getTermFreqVector). You will need to store (when you > construct your Field) and load the term vectors and then calculate > the similarity. A common way of doing this is by calculating the > cosine of the angle between the two vectors. > > -Grant > > -------------------------- > Grant Ingersoll > http://lucene.grantingersoll.com > > Lucene Helpful Hints: > http://wiki.apache.org/lucene-java/BasicsOfPerformance > http://wiki.apache.org/lucene-java/LuceneFAQ > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/Document-Similarities-lucene%28particularly-using-doc-id%27s%29-tf4281286.html#a12229492 Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
