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From Ying Liao <yliao...@gmail.com>
Subject Re: QRDecomposition performance
Date Wed, 23 Jan 2013 23:27:10 GMT
Sean suggests "replacing this with a call to the Apache Commons Math
QRDecomposition" and the sloving time is reduced significantly. Thanks.


On Wed, Jan 23, 2013 at 5:10 PM, Ted Dunning <ted.dunning@gmail.com> wrote:

> That is a long time for such a small qr decomposition.  I wouldn't think
> that the actually solving would add that much time, either.
>
> On Thu, Jan 24, 2013 at 2:00 AM, Ying Liao <yliao422@gmail.com> wrote:
>
> > Hi!
> > The QRDecomposition turns out to be my bottleneck in deploying ALS-WR. It
> > takes less than a ms to solve X=A^{-1}B when A is 20*20. But it takes
> 55ms
> > per solve when A is 60*60. Is there a different approach to solve AX=B?
> >
> > Thanks,
> > Ying
> >
>

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