[jira] Resolved: (MAHOUT-497) Matrix get/set causes allocation (?!)

["Ted Dunning (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Dunning resolved MAHOUT-497.
--------------------------------

    Fix Version/s: 0.4
       Resolution: Fixed

Committed a pretty simple fix.

> Matrix get/set causes allocation (?!)
> -------------------------------------
>
>                 Key: MAHOUT-497
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-497
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Ted Dunning
>             Fix For: 0.4
>
>
> Matrix get and set check the array bounds.  But checking the array bounds calls size.  But size allocates a small integer
> array.
> This is evil and KILLs performance.
> The first fix is to avoid this in SGD based classifiers.  Second will be a real change to the matrix routines to avoid the allocation.

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