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From "Sean Owen (JIRA)" <>
Subject [jira] [Commented] (MAHOUT-667) Persistent storage of factorizations in SVDRecommender
Date Tue, 17 May 2011 11:01:47 GMT


Sean Owen commented on MAHOUT-667:

Since it's a clear bug fix to both of us, and relatively important, I think it's valid to
commit now in our code freeze for 0.5. I will do so.

> Persistent storage of factorizations in SVDRecommender
> ------------------------------------------------------
>                 Key: MAHOUT-667
>                 URL:
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Collaborative Filtering
>    Affects Versions: 0.5
>            Reporter: Chris Newell
>            Assignee: Sebastian Schelter
>            Priority: Minor
>             Fix For: 0.5
>         Attachments: persistent_svd.patch, persistent_svd_v2.patch
>   Original Estimate: 336h
>  Remaining Estimate: 336h
> As discussed previously ( it would be
beneficial to provide a persistent storage mechanism for factorizations created by SVDRecommender
(in package as these can be time consuming
to produce. It would also allow factorizations to be computed on one machine then distributed
to other machines providing predictions, improving efficiency and scalability.
> Having a "persistence strategy" interface has been suggested that could be implemented
as required. I'll try to post a outline proposal for discussion purposes in the next few days
but any comments or suggestions would be very welcome.

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