MAE                     MAE: Mean Absolute Error
PIE                     PIE: A Partially Interpretable Model with
                        Black-box Refinement
PIE_fit                 PIE: Partially Interpretable Model
RPE                     RPE: Relative Prediction Error
data_process            data_process: process tabular data into the
                        format for the PIE model.
predict.PIE             Make Predictions for PIE
sparsity_count          sparsity_count
winequality             Wine Quality Data
