Parametrized Constructor

API Definition

KBest(int K_features, int R, int L, int A, const char *metric, const std::string &init_builder_type);

KBest(int K_features, int R, int L, float A, int graph_opt_iter, const std::string &metric, const std::string &init_builder_type, const std::string &index_type);

Function

Initializes the build of graph search.

Parameters

Parameter	Description	Data Type	Value Range
K_features	Feature dimension.	int	[1, 2999]
R	Number of neighboring nodes.	int	[11, 499]
L	Size of the candidate node list during the graph build.	int	[11, 1999]
A	Angle threshold during the pruning of graph build.	int	[1, 360]
metric	Distance measurement indicator.	const char *	L2 or IP. L2 indicates the Euclidean distance. IP indicates the inner product distance.
init_builder_type	Algorithm for building the k-nearest neighbor graph.	const std::string &	RNNDescent and NNDescent indicate two different algorithms for building the k-nearest neighbor graph. RNNDescent is often used.
graph_opt_iter	Number of rounds for graph index self-iteration.	int	[0, 30]
index_type	Neighbor selection strategy.	const std::string &	HNSW, NSG, TSDG, and SSG indicate the four different neighbor selection strategies.

Parent topic: C++