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From Sebastian Schelter <...@apache.org>
Subject Re: Does RowSimilarity job support down-sampling
Date Wed, 19 Jun 2013 05:55:07 GMT
On 19.06.2013 01:29, Ted Dunning wrote:
> On Tue, Jun 18, 2013 at 11:01 PM, Sebastian Schelter <ssc@apache.org> wrote:
> 
>> We could also move the sampling directly to RowSimilarityJob if people
>> consider this more useful.
> 
> It will have a large effect on the time for the RowSimilarityJob for some
> data.

I put the sampling into PreparePreferenceMatrixJob, because I considered
it to be usecase specific for recommendations.

> Does anybody have an idea about how much of the total time is in
> RowSimilarityJob?

What do you mean by total time? Compared to the rest of the jobs in
ItemSimilarityJob and RecommenderJob?

-sebastian

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