TDAT:     private void updateNearestNeighbours() {
        for (List<V> nn : nearestNeighbours) {
            nn.clear();
        }
        for (int i = 0; i < nearestCentroid.length; ++i) {
            int nearest = nearestCentroid[i];
            nearestNeighbours.get(nearest).add(vectors.get(i));
        }
    }
 COM: <s> pre nearest centroid has been updated with nearest indexes </s>