generate_ball_data      Generate Synthetic Three-class Ball Data
hnp_boxplot             HNP Under-classification Error Box Plot
hnp_map_classes         Classes Mapping function for HNP Algorithm Map
                        ordered class labels to internal levels "1",
                        ..., "T"
hnp_summary             HNP Classifier's Performance Summary
hnp_umbrella            HNP Umbrella Algorithm
train_nn_and_get_scores
                        Neural Network Classifier Helper Function
