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From Robert Muir <>
Subject Re: Lucene's use of vectors
Date Fri, 02 Mar 2012 16:09:52 GMT
On Thu, Mar 1, 2012 at 6:15 PM, Mike O'Leary <> wrote:
> In the Javadoc page for the Similarity class, it says,
> "Lucene combines Boolean model (BM) of Information Retrieval with Vector Space Model
(VSM) of Information Retrieval - documents "approved" by BM are scored by VSM."
> Is the Vector Space Model that is referred to here different than the term vectors that
can optionally be stored in index fields?

Yes, it refers to,
which uses statistics stored in the index. Term vectors are not used

Instead term vectors are really just like storing a separate
individual inverted index for each document. For example, they are
used by MoreLikeThis to retrieve the terms and frequencies from just
that one document.


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