| data_file | Specifying Data Source | 
| data_matrix | Specifying Data Source | 
| data_memory | Specifying Data Source | 
| data_source | Specifying Data Source | 
| output | Exporting Factorization Matrices | 
| output_format | Specifying Output Format | 
| out_file | Specifying Output Format | 
| out_memory | Specifying Output Format | 
| out_nothing | Specifying Output Format | 
| predict | Recommender Model Predictions | 
| Reco | Constructing a Recommender System Object | 
| train | Training a Recommender Model | 
| tune | Tuning Model Parameters |