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[SPARK-16187][ML] Implement util method for ML Matrix conversion in scala/java
## What changes were proposed in this pull request? jira: https://issues.apache.org/jira/browse/SPARK-16187 This is to provide conversion utils between old/new vector columns in a DataFrame. So users can use it to migrate their datasets and pipelines manually. ## How was this patch tested? java and scala ut Author: Yuhao Yang <yuhao.yang@intel.com> Closes #13888 from hhbyyh/matComp.
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- mllib/src/main/scala/org/apache/spark/ml/linalg/MatrixUDT.scala 1 addition, 1 deletion...src/main/scala/org/apache/spark/ml/linalg/MatrixUDT.scala
- mllib/src/main/scala/org/apache/spark/mllib/util/MLUtils.scala 104 additions, 3 deletions.../src/main/scala/org/apache/spark/mllib/util/MLUtils.scala
- mllib/src/test/java/org/apache/spark/mllib/util/JavaMLUtilsSuite.java 27 additions, 2 deletions...st/java/org/apache/spark/mllib/util/JavaMLUtilsSuite.java
- mllib/src/test/scala/org/apache/spark/mllib/util/MLUtilsSuite.scala 55 additions, 1 deletion...test/scala/org/apache/spark/mllib/util/MLUtilsSuite.scala
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