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https://issues.apache.org/jira/browse/SPARK-18201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625733#comment-15625733
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Apache Spark commented on SPARK-18201:
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User 'WeichenXu123' has created a pull request for this issue:
https://github.com/apache/spark/pull/15716
> 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
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> 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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