Hi Dmitriy, If it's OK with you I'd like to try implementing this decoration.
Any advice or guidance would be very much appreciated. Raphael. On 27 Nov, 2011, at 9:23 AM, Dmitriy Lyubimov (Commented) (JIRA) wrote: > Dmitriy Lyubimov commented on MAHOUT-817: > ----------------------------------------- > > For the column mean bruteforce approach is probably the simplest, we 'd have > to decorate input of A with mean subtraction. > >> Add PCA options to SSVD code >> ---------------------------- >> >> Key: MAHOUT-817 >> URL: https://issues.apache.org/jira/browse/MAHOUT-817 >> Project: Mahout >> Issue Type: New Feature >> Affects Versions: 0.6 >> Reporter: Dmitriy Lyubimov >> Assignee: Dmitriy Lyubimov >> Fix For: Backlog >> >> >> It seems that a simple solution should exist to integrate PCA mean >> subtraction into SSVD algorithm without making it a pre-requisite step and >> also avoiding densifying the big input. >> Several approaches were suggested: >> 1) subtract mean off B >> 2) propagate mean vector deeper into algorithm algebraically where the data >> is already collapsed to smaller matrices >> 3) --? >> It needs some math done first . I'll take a stab at 1 and 2 but thoughts and >> math are welcome. > > -- > 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 > >
