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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2014/04/12 11:26:14 UTC

[jira] [Updated] (MAHOUT-1508) Performance problems with sparse matrices

     [ https://issues.apache.org/jira/browse/MAHOUT-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schelter updated MAHOUT-1508:
---------------------------------------

    Summary: Performance problems with sparse matrices  (was: SparseMatrix assign has huge performance problems)

> Performance problems with sparse matrices
> -----------------------------------------
>
>                 Key: MAHOUT-1508
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1508
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>            Reporter: Sebastian Schelter
>            Priority: Blocker
>             Fix For: 1.0
>
>
> I'm currently working with the new Scala DSL and running into a problem with SparseMatrix and SparseRowMatrix.
> The problem is that they don't implement a specialized assign(Matrix other, DoubleDoubleFunction f) function, but use the implementation from AbstractMatrix which loops through all (!) possible entries. 
> We have to fix this asap.



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