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Java svm uses faster Math.pow instead of powi#109

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Java svm uses faster Math.pow instead of powi#109
Druid-of-Luhn wants to merge 1 commit intocjlin1:masterfrom
Druid-of-Luhn:master

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Using the built-in Math.pow method instead of svm's custom powi. This makes the code faster.

I checked this by sampling svm prediction with jvisualvm. powi used to take about 8-10% of the CPU time (with Kernel.dot taking 66-73%). After changing it to Math.pow the time it takes is negligible.

Using the built-in Math.pow method instead of svm's custom powi.
This makes the code faster.
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