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Posted to user@mahout.apache.org by Lee S <sl...@gmail.com> on 2015/08/31 11:21:08 UTC

What does maxRating parameter in ALS recommend algorithm mean?

the max rating of all the items in input data,right?
Can anybody provide me with the related essay link  of the algorithm?

Re: What does maxRating parameter in ALS recommend algorithm mean?

Posted by Pat Ferrel <pa...@occamsmachete.com>.

Google Alternating Least Squares. The science is similar to dimensionality reduction. The algorithm was originally designed to predict user ratings for things like the early netflix 5 star ratings. Now we tend to look at ranking items as more important. 

The max rating is probably to set the highest rating when the ratings are returned as recommendations. Wouldn’t be good to return a rating of 6 to netflix.

On Aug 31, 2015, at 2:21 AM, Lee S <sl...@gmail.com> wrote:

the max rating of all the items in input data,right?
Can anybody provide me with the related essay link  of the algorithm?