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Posted to user@mahout.apache.org by "Y. Sakamoto" <ph...@gmail.com> on 2012/10/18 19:21:23 UTC

Changing "mapred.reduce.tasks" makes various results on recommender

Hi,

I'm using Hadoop-based and non-Hadoop-based recommender.

When I change only hadoop parameter "mapred.reduce.tasks",
 the recommender result also changed.
 (I cannot gain same result.)

Why is it happen?


Thanks

-- 
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       Y. Sakamoto
           phonypianist@gmail.com
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Re: Changing "mapred.reduce.tasks" makes various results on recommender

Posted by Sean Owen <sr...@gmail.com>.

Some algorithms use a random seed, which could give different answers
on the same input. That's the first question.

On Thu, Oct 18, 2012 at 6:21 PM, Y. Sakamoto <ph...@gmail.com> wrote:
> Hi,
>
> I'm using Hadoop-based and non-Hadoop-based recommender.
>
> When I change only hadoop parameter "mapred.reduce.tasks",
>  the recommender result also changed.
>  (I cannot gain same result.)
>
> Why is it happen?
>
>
> Thanks
>
> --
> ///=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>        Y. Sakamoto
>            phonypianist@gmail.com
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=///