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https://issues.apache.org/jira/browse/LUCENE-10054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483729#comment-17483729
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ASF subversion and git services commented on LUCENE-10054:
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Commit 68beb1acb499b5759c9471dcc815e46071558371 in lucene's branch
refs/heads/branch_9x from Mayya Sharipova
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=68beb1a ]
LUCENE-10054 Make HnswGraph hierarchical (#608) (#629)
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.
> Handle hierarchy in HNSW graph
> ------------------------------
>
> Key: LUCENE-10054
> URL: https://issues.apache.org/jira/browse/LUCENE-10054
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Mayya Sharipova
> Priority: Major
> Time Spent: 19h 50m
> Remaining Estimate: 0h
>
> Currently HNSW graph is represented as a single layer graph.
> We would like to extend it to handle hierarchy as per
> [discussion|https://issues.apache.org/jira/browse/LUCENE-9004?focusedCommentId=17393216&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17393216].
>
>
> TODO tasks:
> - add multiple layers in the HnswGraph class
> - modify the format in Lucene90HnswVectorsWriter and
> Lucene90HnswVectorsReader to handle multiple layers
> - modify graph construction and search algorithm to handle hierarchy
> - run benchmarks
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