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  1. Mahout
  2. MAHOUT-1567

Add online sparse dictionary learning (dimensionality reduction)

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      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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            smarthi Suneel Marthi
            mkula Maciej Kula
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