docs: public ClusteringTreeNode nearestChild(double[] pointA) {
  		assert (this.center.length == pointA.length);
  		double minDistance = Double.POSITIVE_INFINITY;
  		ClusteringTreeNode min = null;
  		for (ClusteringTreeNode node : this.getChildren()) {
  			double d = Metric.distance(pointA, node.getCenter());
  			if (d < minDistance) {
  				minDistance = d;
  				min = node;
  			}
  		}
  		return min;
  	}