Subject: syntheticcontroldata clustering example failure due to combiner

For L_2 centroids, you just have to have the mapper emit a trivial sum and a
count (of 1).  The combiner should take a list of vector sums and counts and
produce a combined sum and count.

Then the reducer will get a sums and counts and it should add them together
and divide by the count.

(just like n-dimensional word count!)

On Thu, Jun 11, 2009 at 9:49 AM, Adil Aijaz <[EMAIL PROTECTED]> wrote:
Ted Dunning, CTO

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