Package org.apache.lucene.backward_codecs.lucene91

Class Lucene91OnHeapHnswGraph

  • public final class Lucene91OnHeapHnswGraph
extends HnswGraph
    An HnswGraph where all nodes and connections are held in memory. This class is used to construct the HNSW graph before it's written to the index.

    • Method Detail

      • getNeighbors

        public Lucene91NeighborArray getNeighbors​(int level,
                                          int node)
        Returns the NeighborQueue connected to the given node.
        Parameters:
        level - level of the graph
        node - the node whose neighbors are returned, represented as an ordinal on the level 0.

      • size

        public int size()
        Specified by:
        size in class HnswGraph

      • addNode

        public void addNode​(int level,
                    int node)
        Add node on the given level
        Parameters:
        level - level to add a node on
        node - the node to add, represented as an ordinal on the level 0.

      • seek

        public void seek​(int level,
                 int targetNode)
        Specified by:
        seek in class HnswGraph

      • numLevels

        public int numLevels()
        Returns the current number of levels in the graph
        Specified by:
        numLevels in class HnswGraph
        Returns:
        the current number of levels in the graph

      • entryNode

        public int entryNode()
        Returns the graph's current entry node on the top level shown as ordinals of the nodes on 0th level
        Specified by:
        entryNode in class HnswGraph
        Returns:
        the graph's current entry node on the top level