Method encode

nodedb-vector/src/quantize/pq.rs:123–133

Encode a vector: for each subvector, find the nearest centroid index. This is a per-vector hot-path operation. Governor charging is intentionally skipped here to avoid atomic overhead on every candidate during search; use [`encode_batch`] for bulk encoding with budget enforcement.

(&self, vector: &[f32])

    /// during search; use [`encode_batch`] for bulk encoding with budget
    /// enforcement.
    pub fn encode(&self, vector: &[f32]) -> Vec<u8> {
        debug_assert_eq!(vector.len(), self.dim);
        let mut code = Vec::with_capacity(self.m);
        for sub in 0..self.m {
            let offset = sub * self.sub_dim;
            let sub_vec = &vector[offset..offset + self.sub_dim];
            let nearest = self.nearest_centroid(sub, sub_vec);
            code.push(nearest as u8);
        }
        code
    }

    /// Batch encode all vectors into a contiguous byte array.
    ///