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https://issues.apache.org/jira/browse/MAHOUT-1257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681459#comment-13681459
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Mike Sokolov commented on MAHOUT-1257:
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OK, consider me spanked. I made the variable names more explicit. I didn't
use the in-place subtraction because it would require another addition (as
coded, N depends on the intermediate variable formerly known as P1, now non1).
Seems silly, but since the whole point of the patch is to reduce the number of
arithmetic operations...
> performance improvement to LogLikehood
> --------------------------------------
>
> Key: MAHOUT-1257
> URL: https://issues.apache.org/jira/browse/MAHOUT-1257
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Reporter: Mike Sokolov
> Attachments: MAHOUT-1257.patch
>
>
> This patch reduces the amount of computation required for LLR. It simplifies
> the math by canceling terms. In a microbenchmark we saw an 18% run time
> improvement.
> I couldn't seem to find the UI for uploading a patch file.
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