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From Jake Mannix <>
Subject Re: Fwd: A MapReduce Algorithm for Matrix Multiplication
Date Wed, 09 Dec 2009 02:08:19 GMT
On Tue, Dec 8, 2009 at 5:56 PM, Ted Dunning <> wrote:

> NMF should be amenable to the stochastic decomposition trick.  That reduces
> the problem to a much smaller factorization that you could plausibly do
> using sequential techniques.  Jake Mannix is working on getting
> factorizations going, but I don't know if he has gotten to NMF.

I'm not currently working on NMF, but the stochastic decomposition trick
will be
in there soon, which should allow all this pretty easily.

Although... if you start with a positive matrix, you may want a specialized
projector which preserves positivity for this kind of thing.  But I'm not
sure, I
haven't looked too closely at what happens when you try to do this trick on


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