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https://issues.apache.org/jira/browse/LUCENE-10054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17496888#comment-17496888
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ASF subversion and git services commented on LUCENE-10054:
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Commit 4364bdd63ef58b2094dc252018d3c027302af4f4 in lucene's branch
refs/heads/main from Julie Tibshirani
[ https://gitbox.apache.org/repos/asf?p=lucene.git;h=4364bdd ]
LUCENE-10054: Make sure to use Lucene90 codec in unit tests (#699)
Before we were using the default Lucene91 codec, so we weren't exercising the
old format.
> 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
> Fix For: 9.1
>
> Time Spent: 20h 10m
> 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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