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From Sean Owen <sro...@gmail.com>
Subject Re: From Item-based Recommender to User-based Recommender
Date Wed, 09 May 2012 15:26:05 GMT
Ah, distributed implementation. no there is no such implementation now, but
see: https://issues.apache.org/jira/browse/MAHOUT-1004

On Wed, May 9, 2012 at 4:19 PM, 冯伟 <whitepapers824@gmail.com> wrote:

> Sorry for my poor English. My question is like this: When I use
> "org.apache.mahout.cf.taste.hadoop.item.RecommenderJob", my input file is
> in the format:
> "uid, itemid, rating"
> "uid, itemid, rating"
> "uid, itemid, rating"
> According to the above input,
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob will give item-based
> recommendations. When I exchange the postions of uid and itemid, the input
> file would be
> "itemid, uid, rating"
> "itemid, uid, rating"
> "itemid, uid, rating"
> According to the above input,
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob would generate
> user-based recommendation. Is that right?
>
> 2012/5/9 Sean Owen <srowen@gmail.com>
>
> > Both of these have been implemented since before Mahout. Can you clarify?
> > Don't understand at the moment.
> > On May 9, 2012 3:42 PM, "冯伟" <whitepapers824@gmail.com> wrote:
> >
> > > I found that only item-based recommender is implemented in version-0.6.
> > > When I want to use the user-based recommender, all I need to do is to
> > > transpose the input, i.e., <uid, itemid, rating> ---> <itemid,
uid,
> > > rating>,right? Is there any other differences between item-based and
> > > user-based approach, which is not noticed by me?
> > >
> > > --
> > > Wei Feng
> > >
> >
>
>
>
> --
> Wei Feng
>

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