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