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Posted to dev@mahout.apache.org by "Sebastian Schelter (JIRA)" <ji...@apache.org> on 2014/04/11 08:03:14 UTC
[jira] [Created] (MAHOUT-1508) SparseMatrix assign has huge
performance problems
Sebastian Schelter created MAHOUT-1508:
------------------------------------------
Summary: SparseMatrix assign has huge performance problems
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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Re: [jira] [Created] (MAHOUT-1508) SparseMatrix assign has huge
performance problems
Posted by Dmitriy Lyubimov <dl...@gmail.com>.
+100
On Apr 10, 2014 11:03 PM, "Sebastian Schelter (JIRA)" <ji...@apache.org>
wrote:
> Sebastian Schelter created MAHOUT-1508:
> ------------------------------------------
>
> Summary: SparseMatrix assign has huge performance problems
> 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.
>
>
>
> --
> This message was sent by Atlassian JIRA
> (v6.2#6252)
>