Public Types
typedef int	storage_idx_t
	internal storage of vectors (32 bits: this is expensive)

typedef faiss::Index::idx_t	idx_t
	Faiss results are 64-bit.

Public Member Functions
void	set_default_probas (int M, float levelMult)

void	set_nb_neighbors (int level_no, int n)
	set nb of neighbors for this level (before adding anything)

int	nb_neighbors (int layer_no) const
	nb of neighbors for this level

int	cum_nb_neighbors (int layer_no) const
	cumumlative nb up to (and excluding) this level

void	neighbor_range (idx_t no, int layer_no, size_t begin, size_t end) const
	range of entries in the neighbors table of vertex no at layer_no

	HNSW (int M=32)
	only mandatory parameter: nb of neighbors

int	random_level ()
	pick a random level for a new point

void	fill_with_random_links (size_t n)
	add n random levels to table (for debugging...)

void	add_with_locks (DistanceComputer &ptdis, int pt_level, int pt_id, std::vector< omp_lock_t > &locks, VisitedTable &vt)

void	search (DistanceComputer &qdis, int k, idx_t I, float D, VisitedTable &vt) const
	search interface

void	reset ()

void	clear_neighbor_tables (int level)

void	print_neighbor_stats (int level) const

Public Attributes
std::vector< double >	assign_probas
	assignment probability to each layer (sum=1)

std::vector< int >	cum_nneighbor_per_level

std::vector< int >	levels
	level of each vector (base level = 1), size = ntotal

std::vector< size_t >	offsets

std::vector< storage_idx_t >	neighbors

storage_idx_t	entry_point
	entry point in the search structure (one of the points with maximum level

faiss::RandomGenerator	rng

int	max_level
	maximum level

int	efConstruction
	expansion factor at construction time

int	efSearch
	expansion factor at search time

bool	check_relative_distance
	during search: do we check whether the next best distance is good enough?

int	upper_beam
	number of entry points in levels > 0.

Detailed Description

Definition at line 40 of file IndexHNSW.h.

Member Function Documentation

void faiss::HNSW::add_with_locks	(	DistanceComputer &	ptdis,
		int	pt_level,
		int	pt_id,
		std::vector< omp_lock_t > &	locks,
		VisitedTable &	vt
	)

add point pt_id on all levels <= pt_level and build the link structure for them.

Definition at line 657 of file IndexHNSW.cpp.

void faiss::HNSW::set_default_probas	(	int	M,
		float	levelMult
	)

initialize the assign_probas and cum_nneighbor_per_level to have 2*M links on level 0 and M links on levels > 0

Definition at line 553 of file IndexHNSW.cpp.

std::vector<int> faiss::HNSW::cum_nneighbor_per_level

number of neighbors stored per layer (cumulative), should not be changed after first add

Definition at line 74 of file IndexHNSW.h.

std::vector<storage_idx_t> faiss::HNSW::neighbors

neighbors[offsets[i]:offsets[i+1]] is the list of neighbors of vector i for all levels. this is where all storage goes.

Definition at line 85 of file IndexHNSW.h.

std::vector<size_t> faiss::HNSW::offsets

offsets[i] is the offset in the neighbors array where vector i is stored size ntotal + 1

Definition at line 81 of file IndexHNSW.h.

The documentation for this struct was generated from the following files: