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Posted to dev@mahout.apache.org by "Suneel Marthi (JIRA)" <ji...@apache.org> on 2013/07/25 14:23:50 UTC

[jira] [Updated] (MAHOUT-1166) Multithreaded version of distributed ALS

     [ https://issues.apache.org/jira/browse/MAHOUT-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suneel Marthi updated MAHOUT-1166:
----------------------------------

    Affects Version/s: 0.7
        Fix Version/s: 0.8
    
> Multithreaded version of distributed ALS
> ----------------------------------------
>
>                 Key: MAHOUT-1166
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1166
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.7
>            Reporter: Sebastian Schelter
>            Assignee: Sebastian Schelter
>             Fix For: 0.8
>
>         Attachments: MAHOUT-1166.patch
>
>
> Our implementation of ALS broadcasts the feature matrices in each iteration. Therefore, it makes sense to run the mappers in multithreaded mode to not have to load one copy of the feature matrix per core, but share the read-only in-memory copy.

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