Weichen Xu created SPARK-18201:
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Summary: add toDense and toSparse into Matrix trait, like Vector
design
Key: SPARK-18201
URL: https://issues.apache.org/jira/browse/SPARK-18201
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 2.1.0
Reporter: Weichen Xu
add toDense and toSparse into Matrix trait, like Vector design
so that when we have a Matrix object `matrix: Matrix`, maybe dense or sparse,
we can call `matrix.toDense` to get DenseMatrix
and call `matrix.toSparse` to get SparseMatrix
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