docs: public static int numberOfFreeParameters(Relation<? extends NumberVector> relation, Clustering<? extends MeanModel> clustering) {
      // number of clusters
      int m = clustering.getAllClusters().size(); // num_ctrs
  
      // dimensionality of data points
      int dim = RelationUtil.dimensionality(relation); // num_dims
  
      // number of free parameters
      return (m - 1) + m * dim + m;
    }