AnnIndex                Base class for all nearest neighbour indices
AnnoyIndex              Annoy index
BallTreeIndex           Ball tree index
ExhaustiveIndex         Exhaustive (brute-force) index
HnswIndex               HNSW index
IvfIndex                IVF index
KdTreeIndex             kd forest index
KmknnIndex              kMkNN index
LshIndex                LSH index
NNDescentIndex          NN-Descent index
NsgIndex                NSG index
RnnDescentIndex         Relative NN-Descent index
SoarIndex               SOAR index
VamanaIndex             Vamana 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
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
knn_recall              Recall of an approximate kNN result
load_ann_index          Load an index written by $save()
predict.AnnIndex        Query an index
subsample_queries       Subsample queries from a dataset
