Github user daniloascione commented on the issue:
https://github.com/apache/spark/pull/16353
I am ignoring the value of r_ui in the calculation of MPR because what it
contributes is implicit in the input dataset, where r_ui is expressed with the
pair (label for u,i; predictions for u,i) duplicated exactly r_ui times. With
such an input, r_ui is always equal to one for each u,i. Why to allow
duplicates pairs in the input dataset? Well, I didn't want to change the input
structure which is used also by the others metrics.
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