: Wednesday, December 10, 2014 7:05 PM
To: user@mahout.apache.org
Subject: Re: Collaborative filtering item-based in mahout - without isolating
users
Hi Natalia
Regarding example 1, if you think in terms of likelihood that the two products
have been bought together because they are similar (opposed
-based in mahout - without
isolating users
Hi Natalia
Regarding example 1, if you think in terms of likelihood that the two
products have been bought together because they are similar (opposed to by
chance), the similarity is undefined. As everyone buys 12, of course the
person who bought 11
...@gmail.com]
Sent: Thursday, December 11, 2014 12:00 PM
To: user@mahout.apache.org
Subject: Re: Collaborative filtering item-based in mahout - without isolating
users
otherwise we recommend only very popular items
this is why you have loglikelihood ratio, right?
m
On Thu, Dec 11, 2014 at 11:51 AM
: Thursday, December 11, 2014 12:00 PM
To: user@mahout.apache.org
Subject: Re: Collaborative filtering item-based in mahout - without isolating
users
otherwise we recommend only very popular items
this is why you have loglikelihood ratio, right?
m
On Thu, Dec 11, 2014 at 11:51 AM, Gruszowska
: Wednesday, December 10, 2014 7:05 PM
To: user@mahout.apache.org
Subject: Re: Collaborative filtering item-based in mahout - without
isolating users
Hi Natalia
Regarding example 1, if you think in terms of likelihood that the two
products have been bought together because they are similar
Hi All,
In mahout there is implemented method for item based Collaborative filtering
called itemsimilarity, which returns the similarity between each two items.
In the theory, similarity between two items should be calculated only for users
who ranked both items. During testing I realized that
Hi Natalia
Regarding example 1, if you think in terms of likelihood that the two
products have been bought together because they are similar (opposed to by
chance), the similarity is undefined. As everyone buys 12, of course the
person who bought 11 bough also 12, right?
This if you compute the
