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[SPARK-5513][MLLIB] Add nonnegative option to ml's ALS
This PR ports the NNLS solver to the new ALS implementation. CC: coderxiang Author: Xiangrui Meng <meng@databricks.com> Closes #4302 from mengxr/SPARK-5513 and squashes the following commits: 4cbdab0 [Xiangrui Meng] fix serialization 88de634 [Xiangrui Meng] add NNLS to ml's ALS
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- mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala 84 additions, 11 deletions...c/main/scala/org/apache/spark/ml/recommendation/ALS.scala
- mllib/src/main/scala/org/apache/spark/mllib/optimization/NNLS.scala 1 addition, 3 deletions...main/scala/org/apache/spark/mllib/optimization/NNLS.scala
- mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala 11 additions, 0 deletions...t/scala/org/apache/spark/ml/recommendation/ALSSuite.scala
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