On Sep 3, 2008, at 4:34 AM, Sean Owen wrote:
Yeah it's almost over unfortunately. :) I tried this a while ago with
a slope-one recommender, and was only about able to match Netflix's
current performance. I published some support code for people who
wanted to play with it but removed it from Mahout's copy as legacy
code.
Hmm, probably useful to keep the code around, even if it's just used
as a sample of how to do things w/ Taste. I imagine the Netflix data
will live on for quite some time.
I didn't really have time to investigate more. Some of the insights
that have fallen out from the competition are pretty great. For
example: one person took advantage of a sort of "memory effect" for
recommendations.... people tend to at times over-rate movies and at
times under-rate movies. So if you kind of correct for this -- that a
sequence of 5-star ratings may not be as meaningful as a 5-star rating
in the middle of several 2-star ratings, you get much better
performance.
This nugget of knowledge may be specific to Netflix, not sure. But it
was interesting.
On Wed, Sep 3, 2008 at 9:28 AM, deneche abdelhakim
<[EMAIL PROTECTED]> wrote:
I came across the following competition
http://www.netflixprize.com/index
It's about recommender systems, so I think it's a Taste stuff. The
training dataset consists of more than 100M ratings.
----- Message d'origine ----
De : Josh Myer <[EMAIL PROTECTED]>
À : [email protected]
Envoyé le : Mercredi, 30 Juillet 2008, 18h19mn 25s
Objet : Re: FYI Cloud Computing Resources
On Wed, Jul 30, 2008 at 11:26:29AM -0400, Grant Ingersoll wrote:
http://research.yahoo.com/node/2328
It _MAY_ (stressed, emphasized, etc.) be possible for Mahouters (or
are we just Mahouts?) to get some access to these resources. One
big
question is where can we get some fairly large data sets (large, but
not super large, I think, but am not sure)
If you have ideas, etc. please let us know.
It's worth plugging (theinfo), http://theinfo.org/. It's a project
to
collect references to datasets, and may help here. Unfortunately, it
seems to be laggy at the moment. I'll poke Aaron about that =)
HtH,
--
Josh Myer
[EMAIL PROTECTED]
--------------------------
Grant Ingersoll
http://www.lucidimagination.com
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