const kmeans = require('ml-kmeans');

let data = [
  [1, 1, 1],
  [1, 2, 1],
  [-1, -1, -1],
  [-1, -1, -1.5],
];
let centers = [
  [1, 2, 1],
  [-1, -1, -1],
];

let ans = kmeans(data, 2, { initialization: centers });
console.log(ans);
/*
KMeansResult {
  clusters: [ 0, 0, 1, 1 ],
  centroids: 
   [ { centroid: [ 1, 1.5, 1 ], error: 0.25, size: 2 },
     { centroid: [ -1, -1, -1.25 ], error: 0.0625, size: 2 } ],
  converged: true,
  iterations: 1
}
*/