ml-distance
Version:
Distance and similarity functions to compare vectors
19 lines • 497 B
JavaScript
/**
*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
*
*/
export default 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);
}
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