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From Xiangrui Meng <>
Subject Re: MLib: How to set preferences for ALS implicit feedback in Collaborative Filtering?
Date Tue, 20 Jan 2015 20:38:17 GMT
The assumption of implicit feedback model is that the unobserved
ratings are more likely to be negative. So you may want to add some
negatives for evaluation. Otherwise, the input ratings are all 1 and
the test ratings are all 1 as well. The baseline predictor, which uses
the average rating (that is 1), could easily give you an RMSE of 0.0.

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