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From Floris Devriendt <florisdevrie...@gmail.com>
Subject Re: Discrete Rating Scale
Date Mon, 14 Jul 2014 18:07:33 GMT
Hey Ted Dunning,

What is already possible on multi-modal recommendation in the
non-hadoop-implementation of the Mahout recommenders?
And if it's still under development, do you perhaps have a different
suggestion (within the possibilities of Mahout)?

Best regards,
Floris Devriendt





2014-07-14 18:45 GMT+02:00 Ted Dunning <ted.dunning@gmail.com>:

> I would separate the two interactions.  Type 1 is like.  Type 2 is dislike.
>  They will have different correlations to different predicted interactions.
>
> This is an ideal use case for multi-modal recommendation.  Pat is working
> on bringing that into the DSL as we speak.
>
>
>
> On Mon, Jul 14, 2014 at 7:21 AM, Floris Devriendt <
> florisdevriendt@gmail.com
> > wrote:
>
> > Hey all,
> >
> > When using a discrete rating scale (e.g. likes / dislikes), what are the
> > things that I should consider when using Mahout for Collaborative
> > Filtering?
> >
> > If I'm not mistaking I've read a mail a week or two ago from this mailing
> > list stating that one should avoid using 0 (dislike) and 1 (like) as
> > scores, because Mahout would not be able to take into account the
> dislikes
> > properly.
> > If this is true, what scores should I give to my like/dislike scale?
> (e.g.
> > is -1/1 better than 0/1, or should I use 1/2 with 1 = dislike and 2 =
> > like?)
> >
> > Best regards,
> > Floris Devriendt
> >
>

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