RE: Recommender question

[Jiten Gore]

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