calculate_clustering_metrics
                        Calculate clustering metrics for a confusion
                        matrix
class_entropy           Calculate cluster entropy per class
class_purity            Calculate cluster purity per class
get_conf_mat            Generate a confusion matrix from two
                        classifications/clustering solutions.
get_hard                Decompose soft (fuzzy, probabilistic)
                        membership to hard binary matrix
labels_to_matrix        Make a vector of class labels into a hard
                        binary matrix
overall_entropy         Calculate overall cluster entropy
overall_purity          Calculate overall cluster purity
percentage_agreement    Calculate overall percentage agreement
