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https://issues.apache.org/jira/browse/MAHOUT-737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13051850#comment-13051850
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Tamas Jambor commented on MAHOUT-737:
-------------------------------------

(sorry, patch is coming in a minute.)

this SVD is quite different from the previous one, as this one fills up the 
missing data-points and solves it on the whole matrix, designed for implicit 
datasets. 


> Implicit Alternating Least Squares SVD
> --------------------------------------
>
>                 Key: MAHOUT-737
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-737
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Tamas Jambor
>
> I am sharing this Java implementation of mine that is based on the paper - 
> Collaborative Filtering with Implicit Datasets. The implementation is 
> multi-treading and can be easily extended to use it on Hadoop. In fact this 
> approach would possibly work with non-implicit datasets, but further testing 
> is needed. The algorithm is tried and tested on an implicit TV-viewing 
> dataset, and the performance was pretty good (details to follow). 

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