Github user gaborhermann commented on the issue: https://github.com/apache/flink/pull/1849 Hi @skonto, I did not have time lately to finish up #2838, but I could clean it up next week. Although I believe this PR could be merged separately from mine. (Evaluating ranking recommendations is a bit more complicated.) As @thvasilo mentioned, the documentation is missing in his PR, but most of the work is already in place here. I could easily rebase my PR on top of this, if you don't modify much in the structure of classes. @thvasilo what do you think?
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