Given that this request seems to come up frequently, would it be worth putting this approach under mahout-examples? Initially it could use the brute force approach together with SSVD, and updated later once support is ready for mean-subtraction within SSVD.
I could put something together if there's interest. On Mon, Dec 5, 2011 at 9:40 AM, Dmitriy Lyubimov <[email protected]> wrote: > I am working on the addtions to ssvd algorithms and the mods to current > solver will probably emerge in a matter of a month, my schedule permitting. > > However, a brute force approach is already possible. If your input is of > moderate size, or if it is already dense, you could compute median and > substract it yourself very easily and then shove it into ssvd solver while > requesting to produce either u or v depending if subtract column wise or > row wise mean. > > The only problem with brute force approach is that it would densify > originally sparse input. Depending on your problem and # of machine nodes > you can spare, it may or may not be a problem. > On Dec 4, 2011 7:59 PM, "magicalo" <[email protected]> wrote: > > > Hello, > > > > Is there an expected release date for the PCA algorithm as part of > Mahout? > > Tx! > > > > >
