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#15802 PR: Improvements to similarity-based vector search query
22.8 minutes ago  1 comments  0 votes  0 watches  github-actions[bot], kaivalnp
Description 12679 added a query to perform similarity-based vector searches: matching _all_ ... Change concurrency model from one-thread-per-slice to one-thread-per-segment - See #12160, ... Optimize filtered search by applying conjunction on docs that have vectors - Similar to a KNN ...
    kaivalnp 22.8 minutes ago:  knnPerfTest.py benchmarks (using https://github.com/mikemccand/luceneutil/pull/542) with Cohere v3, ...

#15799 PR: Exclude JNA Cleaner thread from ThreadLeak detection
2.4 hours ago  2 comments  0 votes  0 watches  github-actions[bot], romseygeek, sgup432
JNA Cleaner is a static per-JVM thread that may start up during the execution of a test if JNA is ...
    romseygeek 9.5 hours ago:  We don't use JNA in lucene as far as I can tell, but this can still affect anybody who has some ...

#15800 PR: Optimize HNSW Multi-Vector Search via Document-Centric Short-Circuiting
2.8 hours ago  0 comments  0 votes  0 watches  github-actions[bot], krickert
Problem With the recent introduction of LateInteractionField and the rise of multi-vector models ( ... Standard search treats these as $N$ unique targets, leading to significant CPU waste. If a document has thousands of chunks and one chunk is already securely in the Top-K, standard ...

#15801 PR: Add 4-arg map override to FilterFileChannel
3.1 hours ago  1 comments  0 votes  0 watches  github-actions[bot], ldematte, mayya-sharipova
Java 22 added FileChannel.map(MapMode, long, long, Arena) which returns MemorySegment. The base FileChannel class provides a default implementation that throws UnsupportedOperationExcep ... Without this override, any wrapped FileChannel based on FilterFileChannel would fail when the 4 ...
    mayya-sharipova 3.1 hours ago:  @ldematte would appreciate your review here

#15794: Add maxValueCount to DocValuesSkipper metadata
4.1 hours ago  3 comments  0 votes  0 watches  gaobinlong, martijnvg, romseygeek, sgup432
DescriptionCurrently, if a consumer of a numeric or ordinal-based docvalues iterator wants to know ... This is fragile, and not necessarily supported by Codecs. We could build more consistent checks by storing a global maxValueCount entry on DocValuesSkipper.
    sgup432 4.1 hours ago:  > then they need to access it via DocValues.getSortedXXX and then check to see if the returned ... I also found this to be a somewhat hacky way of determining whether a field is multi-valued when I ... So makes sense to add maxValueCount entry on DocValuesSkipper.
    gaobinlong 21.3 hours ago:  Awesome, we really want this feature, in our use case, we want to know if a docvalues field is ...

#15472 PR: [WIP] Revisiting JVector codec
7.7 hours ago  18 comments  0 votes  0 watches  RKSPD, abernardi597, github-actions[bot], mikemccand, uschindler
Description I took a stab at bringing the OpenSearch JVector codec into Lucene as a codec in ... I made quite a few changes along the way and wanted to cut this PR to share some of those changes/ ... Most notably, I did remove the incremental graph building functionality that is used to speed up ...
    abernardi597 7.7 hours ago:  Here are some of the results from my benchmarking on the Cohere V3 dataset. # Indexing On a m8g.16xlarge EC2 instance running AL2, I indexed 5M documents using 16 ...
    RKSPD 2.6 months ago:  > The JVector specific KNN query seems to have some interesting query-time hyper-parameters: > > ... In my experience with benchmarking, overQueryFactor, threshold, rerankFloor = 0 kept the ... Using the knnPerfTest run parameters we can use the fanout/overSample levers to test apples/apples ...

#15732 PR: Prevent writing vectors twice during merging HNSW graphs
10.3 hours ago  8 comments  0 votes  0 watches  benwtrent, github-actions[bot], iverase, mccullocht, msokolov
This PR is just addressing the following suggestion from Adrien when merging https://github.com/ ... This version only supports un-quantised vectors because for quantise vectors the logic is a bit ... The key aspects of this implementation are: 1.- KnnVectorsWritermergeOneField returns now an ...
    iverase 10.3 hours ago:  In this new iteration I introduced the methods KnnVectorsWriter#mergeFlatVectors and ... The first method is called for all the fields first and after that we call the method ... One important side efect of this work is that we need to make sure that calls to PerFieldKnnVectorsF ...
    iverase 2.4 days ago:  @msokolov working through this I realize we need to make sure the method PerFieldKnnVectorsFormat# ...

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