pub async fn rerank<D: Directory + 'static>(
searcher: &Searcher<D>,
candidates: &[SearchResult],
config: &RerankerConfig,
final_limit: usize,
) -> Result<Vec<SearchResult>>Expand description
Rerank L1 candidates by exact dense vector distance.
Groups candidates by segment for batched I/O, sorts flat indexes for sequential mmap access, and scores all vectors in a single SIMD batch per segment. Reuses buffers across segments to avoid per-candidate heap allocation.
When unit_norm is set in the config, scoring uses dot-product only
(skips per-vector norm computation — ~40% less work).