[ https://issues.apache.org/jira/browse/MAHOUT-1272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Peng Cheng updated MAHOUT-1272: ------------------------------- Attachment: mahout.patch patch > 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 > Labels: features, patch, test > Attachments: mahout.patch, ParallelSGDFactorizer.java, > ParallelSGDFactorizerTest.java > > 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 build > high-performance online recommender as a replacement of the outdated 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira