ml-distance/lib/distances/sorensen.js

Distance and similarity functions to compare vectors

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 *Returns the Sorensen distance between vectors a and b
 * @link [Sorensen algorithm](https://en.wikipedia.org/wiki/S%C3%B8rensen%E2%80%93Dice_coefficient)
 * @param a - first vector
 * @param b - second vector
 *
 */
function sorensen(a, b) {
    let up = 0;
    let down = 0;
    for (let i = 0; i < a.length; i++) {
        up += Math.abs(a[i] - b[i]);
        down += a[i] + b[i];
    }
    return up / down;
}
exports.default = sorensen;
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