LuXugang commented on PR #792:
URL: https://github.com/apache/lucene/pull/792#issuecomment-1102297367

   Thanks @jtibshirani @mayya-sharipova , Indeed, only dense case was coverd in 
[luceneutil](https://github.com/mikemccand/luceneutil), so I write a 
[demo](https://github.com/LuXugang/Lucene-7.5.0/commit/b69ae6c70665878f95115a6a49715c84c760b4c6)
 to run a sparse case test.
   
   vector source: 
   - 3 dimensions
   - 66667 vectors within 100k documents in one segment
   - do `KnnVectorQuery`
   
   NumberOfDocumentsToFind | baseline(search)ms | candidate(search)ms
   -- | -- | --
   10 | 3 | 3
   1000 | 7 | 7
   10000 | 24 | 30
   20000 | 45 | 48
   50000 | 108 | 117
   
   
   
   FORMAT | baseline(indexSize) | candidate(indexSize)
   -- | -- | --
   vec | 781K | 806K
   vem | 278K | 18K
   vex | 4.6M | 4.6M
   
   
   
   
   


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