ml-distance/lib/distances/dice.js

Distance and similarity functions to compare vectors

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 *Returns the Dice distance between vectors a and b
 * @link [Dice algorithm](https://www.naun.org/main/NAUN/ijmmas/mmmas-49.pdf)
 * @param a - first vector
 * @param b - second vector
 *
 */
function dice(a, b) {
    let a2 = 0;
    let b2 = 0;
    let prod2 = 0;
    for (let i = 0; i < a.length; i++) {
        a2 += a[i] * a[i];
        b2 += b[i] * b[i];
        prod2 += (a[i] - b[i]) * (a[i] - b[i]);
    }
    return prod2 / (a2 + b2);
}
exports.default = dice;
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