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https://issues.apache.org/jira/browse/MAHOUT-1567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015014#comment-14015014
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Maciej Kula commented on MAHOUT-1567:
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Thanks, I'll have a look.
My implementation is reasonably fast and very sparse-friendly, but definitely
single machine and not very suitable to distributed computation. (I guess I
could do distributed matrix multiplication but that does not seem like a very
good idea.)
> Add online sparse dictionary learning (dimensionality reduction)
> ----------------------------------------------------------------
>
> Key: MAHOUT-1567
> URL: https://issues.apache.org/jira/browse/MAHOUT-1567
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Reporter: Maciej Kula
>
> I have recently implemented a sparse online dictionary learning algorithm,
> with an emphasis on learning very high-dimensional and very sparse
> dictionaries. It is based on J. Mairal et al 'Online Dictionary Learning for
> Sparse Coding' (http://www.di.ens.fr/willow/pdfs/icml09.pdf). It's an online
> variant of low-rank matrix factorization, suitable for sparse binary matrices
> (such as implicit feedback matrices).
> I would be very happy to bring this up to the Mahout standard and contribute
> to the main codebase --- is this something you would in principle be
> interested in having?
> The code (as well as some examples) are here:
> https://github.com/maciejkula/dictionarylearning
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