Package org.apache.lucene.util.hnsw

Class InitializedHnswGraphBuilder

java.lang.Object

org.apache.lucene.util.hnsw.HnswGraphBuilder

org.apache.lucene.util.hnsw.InitializedHnswGraphBuilder

All Implemented Interfaces:

HnswBuilder

public final class InitializedHnswGraphBuilder
extends HnswGraphBuilder

This creates a graph builder that is initialized with the provided HnswGraph. This is useful for merging HnswGraphs from multiple segments.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.hnsw.HnswGraphBuilder

HnswGraphBuilder.GraphBuilderKnnCollector

Field Summary

Fields inherited from class org.apache.lucene.util.hnsw.HnswGraphBuilder

DEFAULT_BEAM_WIDTH, DEFAULT_MAX_CONN, hnsw, HNSW_COMPONENT, randSeed

Constructor Summary

Constructors

Constructor	Description
InitializedHnswGraphBuilder(RandomVectorScorerSupplier scorerSupplier, int M, int beamWidth, long seed, OnHeapHnswGraph initializedGraph, BitSet initializedNodes)

Method Summary

Modifier and Type	Method	Description
void	addGraphNode(int node)	Inserts a doc with vector value to the graph
static InitializedHnswGraphBuilder	fromGraph(RandomVectorScorerSupplier scorerSupplier, int M, int beamWidth, long seed, HnswGraph initializerGraph, int[] newOrdMap, BitSet initializedNodes, int totalNumberOfVectors)	Create a new HnswGraphBuilder that is initialized with the provided HnswGraph.
static OnHeapHnswGraph	initGraph(int M, HnswGraph initializerGraph, int[] newOrdMap, int totalNumberOfVectors)

Methods inherited from class org.apache.lucene.util.hnsw.HnswGraphBuilder

addVectors, build, create, create, getGraph, setInfoStream

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

InitializedHnswGraphBuilder

public InitializedHnswGraphBuilder(RandomVectorScorerSupplier scorerSupplier,
 int M,
 int beamWidth,
 long seed,
 OnHeapHnswGraph initializedGraph,
 BitSet initializedNodes)
                            throws IOException

Throws:

IOException

Method Details

fromGraph

public static InitializedHnswGraphBuilder fromGraph(RandomVectorScorerSupplier scorerSupplier,
 int M,
 int beamWidth,
 long seed,
 HnswGraph initializerGraph,
 int[] newOrdMap,
 BitSet initializedNodes,
 int totalNumberOfVectors)
                                             throws IOException

Create a new HnswGraphBuilder that is initialized with the provided HnswGraph.

Parameters:

scorerSupplier - the scorer to use for vectors

M - the number of connections to keep per node

beamWidth - the number of nodes to explore in the search

seed - the seed for the random number generator

initializerGraph - the graph to initialize the new graph builder

newOrdMap - a mapping from the old node ordinal to the new node ordinal

initializedNodes - a bitset of nodes that are already initialized in the initializerGraph

totalNumberOfVectors - the total number of vectors in the new graph, this should include all vectors expected to be added to the graph in the future

Returns:

a new HnswGraphBuilder that is initialized with the provided HnswGraph

Throws:

IOException - when reading the graph fails

initGraph

public static OnHeapHnswGraph initGraph(int M,
 HnswGraph initializerGraph,
 int[] newOrdMap,
 int totalNumberOfVectors)
                                 throws IOException

Throws:

IOException

addGraphNode

public void addGraphNode(int node)
                  throws IOException

Description copied from interface: HnswBuilder

Inserts a doc with vector value to the graph

Specified by:

addGraphNode in interface HnswBuilder

Overrides:

addGraphNode in class HnswGraphBuilder

Throws:

IOException