luoxiaojian 45a11212d2 fix(vamana): medoid entry, concurrent build crash and prune quality. (#433) ... * fix(vamana): medoid entry point, concurrent build crash and prune quality - Add DiskANN-standard medoid (centroid-closest point) as the persisted entry point, computed at dump time, replacing the fixed node-0 start. - Fix data races on node_chunks_ / dist_chunks_ / node_chunk_bases_ during concurrent build: add mutexes with double-checked locking and pre-reserve capacity so the lock-free read fast path never hits reallocation. - Fix RobustPrune for metrics with signed internal distance (quantized int8 cosine): introduce IndexMetric::build_distance_offset() to shift distances into a non-negative range, restoring a geometrically meaningful occlude_factor and improving graph quality / low-ef recall.		2026-06-02 16:15:57 +08:00
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CMakeLists.txt	feat: refac entity and impl Vamana. (#371)	2026-04-30 10:22:25 +08:00
vamana_streamer_test.cc	fix(vamana): medoid entry, concurrent build crash and prune quality. (#433)	2026-06-02 16:15:57 +08:00