ml-distance
Version:
Distance and similarity functions to compare vectors
17 lines • 545 B
JavaScript
/**
*Returns the Jensen difference distance between vectors a and b
* @link [Jensen difference algorithm](https://www.naun.org/main/NAUN/ijmmas/mmmas-49.pdf)
* @param a - first vector
* @param b - second vector
*
*/
export default function jensenDifference(a, b) {
let ans = 0;
for (let i = 0; i < a.length; i++) {
ans +=
(a[i] * Math.log(a[i]) + b[i] * Math.log(b[i])) / 2 -
((a[i] + b[i]) / 2) * Math.log((a[i] + b[i]) / 2);
}
return ans;
}
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