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From Jake Mannix <>
Subject Re: Taste-GenericItemBasedRecommender
Date Sun, 13 Dec 2009 17:58:22 GMT
It looks like your results should probably be fairly dense in the end,
right?  So you should be accumulating SparseVectors on a DenseVector output,
at least...  but this should only be a small speedup, not a lower
complexity... as you say, you're already taking advantage of sparseness in
the sums...

I need to dig in and try this myself tonight or tomorrow night...

On Dec 13, 2009 5:12 AM, "Sean Owen" <> wrote:

In my particular case, I just need "Scale" instead of "PlusWithScale",
and that can take advantage of sparseness.

My (er, Ted's) current approach is to sum SparseVectors. This takes
advantage of sparseness already.

Am I missing why a Scale/PlusWithScale implementation, when using
sparseness, would be notably faster?

On Sun, Dec 13, 2009 at 11:11 AM, Jake Mannix <> wrote:
> On Sat, Dec 12, 2009...

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