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#15782 PR: Marking experimental things as such for 104 formats
7.5 minutes ago  0 comments  0 votes  0 watches  benwtrent, github-actions[bot]
This is an oversight in the javadocs. These are actually experimental/expert APIs that can change (just like other vector formats).

#15781 PR: Fix incorrect parameter names in GradientFormatter error messages
1.6 hours ago  0 comments  0 votes  0 watches  github-actions[bot], vinaykpud
Description - Fix error message for maxForegroundColor validation that incorrectly referenced " ...

#15780 PR: Upgrade dependencychecks plugin.
11.2 hours ago  0 comments  0 votes  0 watches  dweiss

#15779 PR: Improve BytesRefHash.add performance by optimize rehash operation
11.8 hours ago  1 comments  0 votes  0 watches  dweiss, github-actions[bot], mikemccand, tyronecai
Description <!-- If this is your first contribution to Lucene, please make sure you have reviewed the ... https://github.com/apache/lucene/blob/main/CONTRIBUTING.md --> Rehashing performance is ...
    dweiss 11.8 hours ago:  This doesn't seem harmful and is a known technique for leveraging cache locality. Seems ok with me.

#15777 PR: Reduce memory usage of NeighborArray (2)
11.9 hours ago  4 comments  0 votes  0 watches  benwtrent, dweiss, github-actions[bot], msokolov, viliam-durina
Use a primitive array for nodes and scores fields instead of an object. The saving is 48 bytes per instance. E.g. new NeighborArray(32, true, System.out::println) prints 152 on current main and 104 after this ...
    viliam-durina 1.2 days ago:  I mean everyone knows how a list works, so I'd definitely suggest to offload the logic to a List ... Thanks for the approvals, btw.
    msokolov 1.3 days ago:  +1 - more readable since we deleted a bunch of hppc classes we had previously forked

#15778: Why are we not doing exact search in findBestEntryPoint on topmost layer?
19.5 hours ago  0 comments  0 votes  0 watches  shubhamvishu
Description It's very likely that this has already been discussed or explored, but I couldn’t ... https://github.com/apache/lucene/blob/665717296595e1a7ca208a1a68cf9bf09dda43cb/lucene/core/src/java ... Intuitively, I thought that the number of nodes on the topmost layer is typically quite small in ...

#15613 PR: Add SPANN (Disk Resident HNSW-IVF) Implementation
20.6 hours ago  24 comments  0 votes  0 watches  atris, github-actions[bot], mccullocht, mikemccand, vigyasharma
Adds Lucene99SpannVectorsFormat, implementing Disk-Resident HNSW-IVF (SPANN) to support vector ... This PR segregatse the index into a Coarse Quantizer (Centroids in HNSW) and the actual Data ( ... Writer flow: Buffers vectors in heap, then runs K-Means++ on flush (using reservoir sampling for ...
    github-actions[bot] 20.6 hours ago:  This PR has not had activity in the past 2 weeks, labeling it as stale. If the PR is waiting for review, notify the dev@lucene.apache.org list. Thank you for your contribution!
    atris 15 days ago:  I finished the 16.41M benchmark on 32GB RAM. SPANN R=1 is the lowest‑latency config observed; recall tops out ~0.847 even with higher NProbe. R=2 fails at full scale due to disk exhaustion.

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