Mahout in Action? Yes it's in there. The output is the average absolute difference between the actual and estimated rating. GroupLens ratings are from 1 to 5. 0.7 average error isn't bad on that scale.
On Thu, Sep 2, 2010 at 3:26 AM, Lance Norskog <[email protected]> wrote: > Ah! What exactly does 0.70 mean as an evaluator output? > > If this is not in HiAction, that's an idea... I don't have my MEAP 0.3 handy.
