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val model = ALS.train(matrix, rank, iterations, regularization_parameter
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Caused by: java.lang.IllegalStateException: Library directory '/hadoop/yarn/local/usercache/spark/appcache/application_1519654131810_0049/container_e11_1519654131810_0049_02_000003/assembly/target/scala-2.11/jars' does not exist; make sure Spark is built.
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