mahout-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Sean Owen <sro...@gmail.com>
Subject Re: Memory and Speed Questions for Item-Based-Recommender
Date Fri, 10 Jul 2009 14:16:37 GMT
On Fri, Jul 10, 2009 at 2:45 PM, Thomas Rewig<trewig@mufin.com> wrote:
> Because I precompute the Item-Similarity-Matrix with a UserBasedSimilarity
> and that DB-Table:
> || aItem || aItemCharacteristic || aItemValue ||  ... so

Oh I see, yes.

> If I use a CachingItemSimilarity I must use a ItemSimilarity:
>
>       aCorrelation = aItemSimilarity.itemSimilarity(item1, item2);
>
> This is in my example and my opinion the similarity between
> aItemCharacteristic1 and aItemCharacteristic2 and this isn't interesting for
> me.
> So I must use the UserSimilarity objects and the UserBasedRecommender
> although I would prefer the ItemBasedRecommender.

OK so use CachingUserSimilarity then. There are versions for both.


> Yes real-time is the dream :-) but I know this will be hard to reach. I
> first will follow your hints and if the worst-case recommendation will no
> longer be 80s I'm happy :-).

Yes 80 seconds is not reasonable.

Mime
View raw message