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https://issues.apache.org/jira/browse/MAHOUT-1272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peng Cheng updated MAHOUT-1272:
-------------------------------
Description:
a parallel factorizer based on MAHOUT-1089 may achieve better performance on
multicore processor.
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 building
high-performance online recommender as a replacement of the outdated slope-one.
The new factorizer can implement either DSGD
(http://www.mpi-inf.mpg.de/~rgemulla/publications/gemulla11dsgd.pdf) or
hogwild! (www.cs.wisc.edu/~brecht/papers/hogwildTR.pdf).
Related discussion has been carried on for a while but remain inconclusive:
http://web.archiveorange.com/archive/v/z6zxQUSahofuPKEzZkzl
was:
a parallel factorizer based on MAHOUT-1089
(https://issues.apache.org/jira/browse/MAHOUT-1089) may achieve better
performance on multicore processor.
current patch of MAHOUT-1089 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 building
high-performance online recommender as a replacement of the outdated slope-one.
The new factorizer can implement either DSGD
(http://www.mpi-inf.mpg.de/~rgemulla/publications/gemulla11dsgd.pdf) or
hogwild! (www.cs.wisc.edu/~brecht/papers/hogwildTR.pdf).
Related discussion has been carried on for a while but remain inconclusive:
http://web.archiveorange.com/archive/v/z6zxQUSahofuPKEzZkzl
> Parallel SGD matrix factorizer for SVDrecommender
> -------------------------------------------------
>
> Key: MAHOUT-1272
> URL: https://issues.apache.org/jira/browse/MAHOUT-1272
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Reporter: Peng Cheng
> Assignee: Sean Owen
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> a parallel factorizer based on MAHOUT-1089 may achieve better performance on
> multicore processor.
> 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 building
> high-performance online recommender as a replacement of the outdated
> slope-one.
> The new factorizer can implement either DSGD
> (http://www.mpi-inf.mpg.de/~rgemulla/publications/gemulla11dsgd.pdf) or
> hogwild! (www.cs.wisc.edu/~brecht/papers/hogwildTR.pdf).
> Related discussion has been carried on for a while but remain inconclusive:
> http://web.archiveorange.com/archive/v/z6zxQUSahofuPKEzZkzl
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