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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1365) Weighted ALS-WR iterator for Spark
Date Thu, 20 Feb 2014 08:19:19 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906752#comment-13906752
] 

Dmitriy Lyubimov commented on MAHOUT-1365:
------------------------------------------

 that's reasonable encoding i suppose. Good idea.

> Weighted ALS-WR iterator for Spark
> ----------------------------------
>
>                 Key: MAHOUT-1365
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1365
>             Project: Mahout
>          Issue Type: Task
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>             Fix For: 1.0
>
>         Attachments: distributed-als-with-confidence.pdf
>
>
> Given preference P and confidence C distributed sparse matrices, compute ALS-WR solution
for implicit feedback (Spark Bagel version).
> Following Hu-Koren-Volynsky method (stripping off any concrete methodology to build C
matrix), with parameterized test for convergence.
> The computational scheme is following ALS-WR method (which should be slightly more efficient
for sparser inputs). 
> The best performance will be achieved if non-sparse anomalies prefilitered (eliminated)
(such as an anomalously active user which doesn't represent typical user anyway).
> the work is going here https://github.com/dlyubimov/mahout-commits/tree/dev-0.9.x-scala.
I am porting away our (A1) implementation so there are a few issues associated with that.



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