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https://issues.apache.org/jira/browse/MAHOUT-497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907381#action_12907381
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Jonathan Young commented on MAHOUT-497:
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Are you planning on creating the integer array once, by adding int[]
cardinality to AbstractMatrix, or did you have another solution in mind?
> 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
>
> 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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