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fix: increase ANN search K from 50 to 200 for 72K+ person pool #7

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Merged
davidhoo merged 1 commit into from
May 19, 2026
Merged

fix: increase ANN search K from 50 to 200 for 72K+ person pool #7

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4 changes: 2 additions & 2 deletions backend/internal/service/person_merge_suggestion_ann.go
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Original file line number Diff line number Diff line change
Expand Up @@ -8,9 +8,9 @@ import (
)

const (
annSearchK = 50 // neighbors per prototype query
annSearchK = 200 // neighbors per prototype query; 72K+ person pool needs wider net than 50
annHNSWM = 16 // max neighbors per node; 16 gives better recall at 60K+ scale vs 8
annHNSWEfSearch = 100 // search beam width; high value ensures recall near threshold boundary
annHNSWEfSearch = 200 // search beam width; must be >= annSearchK
)

// annIndex is a cached HNSW nearest-neighbor index over all person prototype embeddings.
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