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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: how to run PCA from Mahout
Date Tue, 06 Sep 2011 19:24:45 GMT
Sure.

Do the subtraction after the B = Q'A step in the random projection!

On Tue, Sep 6, 2011 at 7:16 PM, Dmitriy Lyubimov <dlieu.7@gmail.com> wrote:

> On Tue, Sep 6, 2011 at 12:11 PM, Ted Dunning <ted.dunning@gmail.com>
> wrote:
> > Note that normally subtracting anything fills in sparse matrices.
>
> is there a way to cope with this without changing SVD contracts?
>

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