Function ground_truth

nodedb-vector/src/codec_index/search.rs:213–221

Brute-force top-k by L2-squared.

(vecs: &[Vec<f32>], query: &[f32], k: usize)

    /// Brute-force top-k by L2-squared.
    fn ground_truth(vecs: &[Vec<f32>], query: &[f32], k: usize) -> Vec<u32> {
        let mut scored: Vec<(f32, u32)> = vecs
            .iter()
            .enumerate()
            .map(|(i, v)| (l2_squared(query, v), i as u32))
            .collect();
        scored.sort_unstable_by(|a, b| a.0.total_cmp(&b.0));
        scored.into_iter().take(k).map(|(_, id)| id).collect()
    }

    // ── Sq8 round-trip ────────────────────────────────────────────────────────