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From "John Compitello (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-20109) Need a way to convert from IndexedRowMatrix to Dense Block Matrices
Date Tue, 28 Mar 2017 15:24:41 GMT

     [ https://issues.apache.org/jira/browse/SPARK-20109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

John Compitello updated SPARK-20109:
------------------------------------
    Summary: Need a way to convert from IndexedRowMatrix to Dense Block Matrices  (was: Need
a way to convert from IndexedRowMatrix to Block)

> 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: New Feature
>          Components: MLlib
>    Affects Versions: 2.1.0
>            Reporter: John Compitello
>
> 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. 



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