Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/772#issuecomment-109926023
I created a [JIRA
ticket](https://issues.apache.org/jira/browse/FLINK-2157?filter=12331885) for
the evaluation of predictors. I think we should deal with it separately in
order to keep the PR small and reviewable. But I agree, this is an important
feature for any ML library.
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