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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2017/06/01 09:45:04 UTC
[jira] [Assigned] (SPARK-20109) Need a way to convert from
IndexedRowMatrix to Dense Block Matrices
[ https://issues.apache.org/jira/browse/SPARK-20109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen reassigned SPARK-20109:
---------------------------------
Assignee: John Compitello
Issue Type: Improvement (was: New Feature)
> Need a way to convert from IndexedRowMatrix to Dense Block Matrices
> -------------------------------------------------------------------
>
> Key: SPARK-20109
> URL: https://issues.apache.org/jira/browse/SPARK-20109
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.1.0
> Reporter: John Compitello
> Assignee: John Compitello
> Priority: Minor
> Fix For: 2.3.0
>
>
> The current implementation of toBlockMatrix on IndexedRowMatrix is insufficient. It is implemented by first converting the IndexedRowMatrix to a CoordinateMatrix, then converting that CoordinateMatrix to a BlockMatrix. Not only is this slower than it needs to be, it also means that the created BlockMatrix ends up being backed by instances of SparseMatrix, which a user may not want. Users need an option to convert from IndexedRowMatrix to BlockMatrix that backs the BlockMatrix with local instances of DenseMatrix.
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