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From "Peng Cheng (JIRA)" <>
Subject [jira] [Updated] (MAHOUT-1272) Parallel SGD matrix factorizer for SVDrecommender
Date Sat, 06 Jul 2013 03:07:49 GMT


Peng Cheng updated MAHOUT-1272:

    Attachment: mahout.patch

> Parallel SGD matrix factorizer for SVDrecommender
> -------------------------------------------------
>                 Key: MAHOUT-1272
>                 URL:
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Collaborative Filtering
>            Reporter: Peng Cheng
>            Assignee: Sean Owen
>              Labels: features, patch, test
>         Attachments: mahout.patch,,
>   Original Estimate: 336h
>  Remaining Estimate: 336h
> a parallel factorizer based on MAHOUT-1089 may achieve better performance on multicore
> existing code is single-thread and perhaps may still be outperformed by the default ALS-WR.
> In addition, its hardcoded online-to-batch-conversion prevents it to be used by an online
recommender. An online SGD implementation may help build high-performance online recommender
as a replacement of the outdated slope-one.
> The new factorizer can implement either DSGD (
or hogwild! (
> Related discussion has been carried on for a while but remain inconclusive:

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