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. /Manuel 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 Twitter: http://twitter.com/Manuel_B
