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From Sean Owen <>
Subject Re: Taste-GenericItemBasedRecommender
Date Sun, 13 Dec 2009 08:11:57 GMT
On Sun, Dec 13, 2009 at 3:24 AM, Jake Mannix <> wrote:
>  You do the co-occurrence matrix (for item-by-item, right?) on Hadoop too,
> and that part is really fast, but computing the recommendations is very
> slow?  By what orders of magnitude, for the whole set?
> What are the scales you are testing with, in terms of total number of users,
> items, and ratings?

Yes, for about 10M ratings (tens of thousands of users and items) the
co-occurrence matrix counts take a couple minutes, and then recs are
on track to take a day or two.

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