A wrapper is needed then because Commons Math takes in and outputs in different data structure.
On Mon, Jan 28, 2013 at 3:14 AM, Sean Owen <[email protected]> wrote: > Is it worth simply using the Commons Math implementation? > > On Mon, Jan 28, 2013 at 8:04 AM, Sebastian Schelter <[email protected]> > wrote: > > This is great news and will automatically boost the performance of all > > our ALS-based recommenders which are all using QRDecomposition > internally. > > > > On 28.01.2013 04:02, Ted Dunning wrote: > >> Did that. > >> > >> You are right. The QRD in mahout is abysmally slow. I wrote a new > version > >> on the airplane that seems to be about 10x faster and still jsut about > as > >> accurate (and vastly simpler). I will put up some tests and a patch in > the > >> next week or so. > > >
