I think Tamas referred to matrices that are symmetric (only the upper triangular half would need to be stored) not diagonal matrices.
On 14.01.2012 05:25, Lance Norskog wrote: > org.apache.mahout.math.DiagonalMatrix > > It even supports sparse values in the diagonal! > > On Fri, Jan 13, 2012 at 9:00 AM, Tamas Jambor (Commented) (JIRA) > <[email protected]> wrote: >> >> [ >> https://issues.apache.org/jira/browse/MAHOUT-737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185670#comment-13185670 >> ] >> >> Tamas Jambor commented on MAHOUT-737: >> ------------------------------------- >> >> I think so. When will you be releasing 0.6? I am planning to do a bit more >> extensive testing in the next 2-3 weeks. >> >>> Implicit Alternating Least Squares SVD >>> -------------------------------------- >>> >>> Key: MAHOUT-737 >>> URL: https://issues.apache.org/jira/browse/MAHOUT-737 >>> Project: Mahout >>> Issue Type: New Feature >>> Components: Collaborative Filtering >>> Affects Versions: 0.6 >>> Reporter: Tamas Jambor >>> Assignee: Sebastian Schelter >>> Attachments: MAHOUT-737-2.patch, MAHOUT-737.patch, >>> MAHOUT-737.patch, MAHOUT-737.patch, MAHOUT-737.patch >>> >>> >>> I am sharing this Java implementation of mine that is based on the paper - >>> Collaborative Filtering with Implicit Datasets. The implementation is >>> multi-treading and can be easily extended to use it on Hadoop. In fact this >>> approach would possibly work with non-implicit datasets, but further >>> testing is needed. The algorithm is tried and tested on an implicit >>> TV-viewing dataset, and the performance was pretty good (details to follow). >> >> -- >> This message is automatically generated by JIRA. >> If you think it was sent incorrectly, please contact your JIRA >> administrators: >> https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa >> For more information on JIRA, see: http://www.atlassian.com/software/jira >> >> > > >
