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From Sean Owen <sro...@gmail.com>
Subject Re: ItemSimilarityJob as UserSimilarityJob
Date Fri, 08 Apr 2011 10:12:47 GMT
Yep you can definitely do that, no problem.

On Fri, Apr 8, 2011 at 11:04 AM, Thomas Rewig <trewig@mufin.com> wrote:

>  Hello,
>
> I am testing at the moment a bit with mahout-jobs in hadoop.
>
> As I understand it:
> * the Recommender Job computes item-recommendations for all users
> * and the ItemSimilarityJob computes all item-item-similaritys
>
> I wonder if there is a job for the calculation of user-user-similaritys ..
> a UserSimilarityJob (Or have I write my own recommenderJob?). In my opinion
> the RowSimilartityJob is not for this purpose, or?
>
> So if i have this data:
>
> |userID1,itemID1,preferencevalue|
> |userID1,itemID2,preferencevalue
> ||userID2,itemID1,preferencevalue|
> |userID2,itemID3,preferencevalue
> ...
>
> and transform it to
> |
> |itemID1||,||userID1||,preferencevalue|
> |itemID1||||,||userID2||,preferencevalue
> ||itemID||2,||userID1||,preferencevalue|
> |itemID3||||,||userID2||,preferencevalue
> ...
>
> ||i can use the |ItemSimilarityJob to get all user-user-similaritys and
> this should be the same result I would expect in a UserSimilarityJob. But is
> there an easier way without a transformation of the data i use to get all
> user-user-similartitys?
>
> Or have I missed something?
>
> I use mahout 0.4.
>
> Thanks in advance!
> Thomas
>
>
>
>

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