Github user davies commented on the pull request: https://github.com/apache/spark/pull/4023#issuecomment-69816419 It did not have problems right now, some one hit this while working on other algorithms/API, see http://apache-spark-developers-list.1001551.n3.nabble.com/Python-to-Java-object-conversion-of-numpy-array-td10065.html
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