Jiten, User and Book ids should be 0,1,2 etc. Plz don't use negative integers.
Since I don't understand +ve/-ve you mentioned, but if you know which books belong to class A/B, you can filter the output correlation matrix yourself to get what you want. Peng Zhang -- Sent from my iPhone > On Jul 11, 2014, at 9:49 AM, "Jiten Gore" <ji...@gores.net> wrote: > > Thanks for your reply, Pat. Here's an illustration: > > The input set looks like this: > User Book Preference > 1 10 7 > 2 10 4 > 3 10 5 > 1 15 3 > 2 15 8 > 3 15 4 > 1 20 9 > 2 20 2 > 3 20 3 > 1 -1 8 > 2 -1 8 > 3 -1 2 > 1 -2 5 > 2 -2 6 > 3 -2 4 > 1 -3 7 > 2 -3 5 > 3 -4 3 > ... > > For this set for the books (+ve set) I am interested in only the > recommendations for the Books (-ve set) > > The desired output (the values are made up): > Book1 Book2 ρ-value > 10 -2 0.75 > 10 -3 0.66 > 10 -1 0.41 > 15 -1 0.80 > 15 -2 0.55 > 15 -3 0.21 > 20 -2 0.91 > 20 -1 0.65 > 20 -3 0.47 > > Thus, I would *not* like to see the ones like these two: > 10 20 0.61 > -1 -2 0.73 > > Does this help in clarifying? And yes I am interested in Pearson correlation > and I am using Hadoop. > > Best, > Jiten > > -----Original Message----- > From: Pat Ferrel [mailto:pat.fer...@gmail.com] > Sent: Thursday, July 10, 2014 1:42 PM > To: user@mahout.apache.org > Subject: Re: Recommender question > > Can you rephrase this "I would like to see recommendations for A class books > only out of those from class B." > > > On Jul 10, 2014, at 11:25 AM, Jiten Gore <ji...@gores.net> wrote: > > Dear Mahout community, > > I am running an item based recommender on Mahout and using the Amazon > paradigm, consider that there are books - two classes of books, one (A) > coded with +ve ID values and the other (B) with -ve values for ID. > > I would like to see recommendations for A class books only out of those from > class B. The user ratings structure is the same for both classes. > > I will appreciate any pointers you might have. > > Best, > Jiten > > Sent from my iPhone > > >
