| AnnIndex | Base class for all nearest neighbour indices |
| AnnoyIndex | Annoy index |
| ann_get_threads | Number of threads used for index builds and queries |
| ann_set_threads | Set the number of threads for index builds and queries |
| BallTreeIndex | Ball tree index |
| ExhaustiveIndex | Exhaustive (brute-force) index |
| generate_cell_embeddings | Generate synthetic cell embeddings |
| generate_clustered_data | Generate clustered synthetic data |
| generate_correlated_data | Generate correlated synthetic data |
| generate_low_rank_data | Generate low-rank synthetic data |
| HnswIndex | HNSW index |
| IvfIndex | IVF index |
| KdTreeIndex | kd forest index |
| KmknnIndex | kMkNN index |
| knn_recall | Recall of an approximate kNN result |
| load_ann_index | Load an index written by $save() |
| LshIndex | LSH index |
| NNDescentIndex | NN-Descent index |
| NsgIndex | NSG index |
| predict.AnnIndex | Query an index |
| RnnDescentIndex | Relative NN-Descent index |
| SoarIndex | SOAR index |
| subsample_queries | Subsample queries from a dataset |
| VamanaIndex | Vamana index |