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From Manuel Blechschmidt <>
Subject Re: Recommending already consumed items
Date Tue, 03 Dec 2013 19:22:58 GMT
Hi Mario,
you can just provide 2 different group of recommendations:

1. Your personal favorites
2. You might also like.

This is how I solved this problem for another project.


On 02.12.2013, at 21:22, Mario Levitin wrote:

> Hi all,
> In some recommender applications the system might recommend already
> consumed items. For example, a hotel recommendation site might recommend
> hotel A to a user who already stayed at hotel A before.
> In order to recommend already consumed items we have to rank all of the
> items (consumed and unconsumed ones)
> My problem is how can we rank all the items? Let me explain.
> If ratings are available I think the problem is easily solved. We can rank
> all the items because we have both the ratings given by the user and the
> predicted ratings.
> However, what should we do if there are no ratings, that is, using Mahout
> terms we have boolean preferences.
> Mahout booleanpreferences recommender returns a value for each unconsumed
> item so that we can rank them. However, we cannot compare these values with
> the items the user already consumed. Already consumed items have no
> predicted value.
> I hope I could explain the problem.
> Thanks in advance.

Manuel Blechschmidt
M.Sc. IT Systems Engineering
Dortustr. 57
14467 Potsdam
Mobil: 0173/6322621

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