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From Sean Owen <>
Subject Re: Would like some recommendation, need advice
Date Mon, 22 Jun 2009 20:32:24 GMT
I see. This almost is not a 'classic' recommendation problem. If you
have user-subject similarity, and subject-item similarity already,
then user-item similarity is probably just the product of the two? so
you can recommend items by ordering by similarity.

That is, in particular, it sounds like you don't really have a notion
of 'ratings' from users to items, which is what this library really is
all about.

Am I right, or do you have user ratings?

On Mon, Jun 22, 2009 at 4:24 PM, charlysf<> wrote:
> Thank you,
> In fact, I need the similarity in database to be able to give the
> neighborhood and similar users and similar items.
> Right now, for my users, I have this table : user_a_id, user_b_id,
> similarity
> And I have the same for items.
> I would like to do some implicit recommendation, and I know that an user is
> linked to some topics, and an item too. A topic is what I call my subject.
> That's why I have a link between users and subjects and items and subjects.

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