# Package org.apache.lucene.codecs.hnsw

package org.apache.lucene.codecs.hnsw
HNSW vector helper classes. The classes in this package provide a scoring and storing mechanism for vectors stored in a flat file. This allows for HNSW formats to be extended with other flat storage formats or scoring without significant changes to the HNSW code. Some examples for scoring include `ScalarQuantizedVectorScorer` and `DefaultFlatVectorScorer`. Some examples for storing include `Lucene99FlatVectorsFormat` and `Lucene99ScalarQuantizedVectorsFormat`.

Related Packages
Package
Description
org.apache.lucene.codecs
Codecs API: API for customization of the encoding and structure of the index.
Class
Description
DefaultFlatVectorScorer
Default implementation of `FlatVectorsScorer`.
FlatFieldVectorsWriter<T>
Vectors' writer for a field
FlatVectorScorerUtil
Utilities for `FlatVectorsScorer`.
FlatVectorsFormat
Encodes/decodes per-document vectors and provides a scoring interface for the flat stored vectors
FlatVectorsReader
Reads vectors from an index.
FlatVectorsScorer
Provides mechanisms to score vectors that are stored in a flat file The purpose of this class is for providing flexibility to the codec utilizing the vectors
FlatVectorsWriter
Vectors' writer for a field that allows additional indexing logic to be implemented by the caller
HnswGraphProvider
An interface that provides an HNSW graph.
ScalarQuantizedVectorScorer
Default scalar quantized implementation of `FlatVectorsScorer`.
ScalarQuantizedVectorScorer.ScalarQuantizedRandomVectorScorerSupplier
Quantized vector scorer supplier