Hi guys,

I'd like to use mahout to implement a recommender but I'm encountering a
problem:

Ids of items and users are represented in Mahout as long integers, while my
data comes from an external database that uses strings to identify items and
users.

Any suggestion as to how I can fix this problem?

Thanks a lot

Claudia

Hi Claudia,
you have to use an IDMigrator.

The following projects shows you an example:
https://github.com/ManuelB/facebook-recommender-demo

https://github.com/ManuelB/facebook-recommender-demo/blob/master/src/main/java/de/apaxo/bedcon/FacebookRecommender.java

Good luck
    Manuel

On 05.03.2012, at 09:53, Claudia Grieco wrote:

> Hi guys,
>
> I'd like to use mahout to implement a recommender but I'm encountering a
> problem:
>
> Ids of items and users are represented in Mahout as long integers, while my
> data comes from an external database that uses strings to identify items and
> users.
>
> Any suggestion as to how I can fix this problem?
>
> Thanks a lot
>
> Claudia
>

--
Manuel Blechschmidt
Dortustr. 57
14467 Potsdam
Mobil: 0173/6322621
Twitter: http://twitter.com/Manuel_B

No. It used to work this way, but was removed just because you get
much better memory and performance using longs. It would be a lot of
surgery to undo this.

The best answer is to use longs. If you must use strings, IDMigrator
does the trick quite well.

On Thu, Mar 8, 2012 at 1:27 PM, Claudia Grieco <[EMAIL PROTECTED]> wrote:
> Do you think it's worth the work to change the internal code of Mahout in
> order to use string identifiers?
> Thanks
> Claudia
>