Github user thvasilo commented on the pull request:
https://github.com/apache/flink/pull/871#issuecomment-117992843
Changed the approach slightly after Till's suggestion, it is now possible
to have the score function for chained predictors, without needing a new
operation.
Note that we are assuming that Predictors are supervised learning
algorithms in the way score is defined currently. That will have to change once
unsupervised learning algorithms like KMeans clustering are merged.
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