Peng Cheng created MAHOUT-1272:
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Summary: 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
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high-performance online recommender as a replacement of the outdated slope-one.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
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