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From "Sebastian Schelter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAHOUT-1166) Multithreaded version of distributed ALS
Date Sat, 16 Mar 2013 11:52:12 GMT

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

Sebastian Schelter updated MAHOUT-1166:
---------------------------------------

    Attachment: MAHOUT-1166.patch
    
> 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
>            Reporter: Sebastian Schelter
>            Assignee: Sebastian Schelter
>         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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