Github user mengxr commented on the pull request: https://github.com/apache/spark/pull/597#issuecomment-42274037 @techaddict For training, we should keep the `r - 2.5`s, which indicate confidence. For evaluation, we could either use `if (r > 2.5) 1.0 else 0.0` or weighted RMSE suggested by @srowen . Also, we need to map the predictions to interval `[0.0, 1.0]`.
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