mayya-sharipova opened a new pull request #608:
URL: https://github.com/apache/lucene/pull/608
Currently HNSW has only a single layer.
This patch makes HNSW graph multi-layered.
This PR is based on the following PRs:
#250, #267, #287, #315, #536, #416
Main changes:
- Multi layers are introduced into HnswGraph and HnswGraphBuilder
- A new Lucene91HnswVectorsFormat with new Lucene91HnswVectorsReader
and Lucene91HnswVectorsWriter are introduced to encode graph
layers' information
- Lucene90Codec, Lucene90HnswVectorsFormat, and the reading logic of
Lucene90HnswVectorsReader and Lucene90HnswGraph are moved to
backward_codecs to support reading and searching of graphs built
in pre 9.1 version. Lucene90HnswVectorsWriter is deleted.
- For backwards compatible tests, previous Lucene90 graph reading and
writing logic was copied into test files of
Lucene90RWHnswVectorsFormat, Lucene90HnswVectorsWriter,
Lucene90HnswGraphBuilder and Lucene90HnswRWGraph.
TODO: tests for KNN search for graphs built in pre 9.1 version;
tests for merge of indices of pre 9.1 + current versions.
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