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Date: Wed, 9 May 2012 23:19:03 +0800
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Subject: Re: From Item-based Recommender to User-based Recommender
From: =?GB2312?B?t+vOsA==?= <whitepapers824@gmail.com>
To: user@mahout.apache.org
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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, "=B7=EB=CE=B0" <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>=A3=ACright? Is there any other differences between item-based a=
nd
> > user-based approach, which is not noticed by me?
> >
> > --
> > Wei Feng
> >
>


--=20
Wei Feng

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