docs: public void setInitialClusters(List<? extends Cluster<? extends MeanModel>> initialMeans) {
      double[][] vecs = new double[initialMeans.size()][];
      for(int i = 0; i < vecs.length; i++) {
        vecs[i] = initialMeans.get(i).getModel().getMean();
      }
      this.initialMeans = vecs;
    }