| AP | Associated Press data | 
| error_A | The l_1 distance between two thin matrices up to a column permuation | 
| simplex_dist | The l_2 distance between a point and a simplex | 
| topic_score | The Topic SCORE algorithm | 
| vertices_est | The vertex hunting in the Topic SCORE algorithm | 
| W_from_AD | Estimation of W from A and X |