Github user tillrohrmann commented on the pull request: https://github.com/apache/flink/pull/1033#issuecomment-132966338 I'm not a Gelly expert, but conceptually I don't think that it is wrong to call an algorithm which was developed with the Scala API from within the Java API. Otherwise this would mean that every algorithm which was implemented using the Scala API would have to be reimplemented for the Java API as well. And then it is the question why developing the algorithm with the Scala API in the first place, if you can run algorithms written with the Java API from within the Scala API? But maybe I'm mistaken here.
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