On Feb 20, 2006, at 9:47 PM, Otis Gospodnetic wrote:
As far as I can tell, most people use TermVectors for "more like
this" queries (see MoreLikeThis class in contrib/ somewhere)
On Feb 21, 2006, at 5:39 AM, Erik Hatcher wrote:
I use term vectors for "more like this" queries, such as the links
you'll see here:
<http://www.rossettiarchive.org/rose/?query=%2B%28%2Bblessed+%
2Bdamozel%29+%2B%28archivetype%3Arad%29>
Thanks, Otis and Erik. (MoreLikeThis is under contrib/similarity.)
Looking at the way MoreLikeThis is implemented, my impression is that
it wouldn't hurt and might help a smidge to store the term vector
with the stored document.
What I don't yet see is a benefit to having all TermVectors reside
side-by-side in the same file. A full vector-space search which
compares complete document vectors and thus needs to scan through all
TermVectors for each query is the only application I've thought of so
far. Of course such a beast is impractical for a search engine of
any reasonable size, so you need some method of data reduction.
LSI's decomposition is one way of hacking at that problem, but you
don't do that on the fly at search-time. :) Another is the heuristic
process applied by the MoreLikeThis class, but MoreLikeThis only
needs a single document's TermVectors.
Marvin Humphrey
Rectangular Research
http://www.rectangular.com/
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