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From Ted Dunning <>
Subject Re: How can I manually specify user similarities in the user-based algorithm?
Date Sun, 15 Feb 2015 00:10:02 GMT
On Sat, Feb 14, 2015 at 6:05 AM, Eugenio Tacchini <> wrote:

> Hi Pat, I don't understand why it is not a Mahout problem, my goal is to
> evaluate (RMSE) the output of a user based algorithm comparing different
> user similarity measures, Mahout already has everything I need except the
> fact I cannot give in input a custom similarity matrix.

You should be able to implement a special user similarity function that is
simply a lookup.  If you have all the distances, then you aren't worried
about efficiency, by definition.

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