ml-distance/lib/distances/jensenDifference.js

Distance and similarity functions to compare vectors

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 *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
 *
 */
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;
}
exports.default = jensenDifference;
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