Method prepare_query

nodedb-codec/src/vector_quant/bbq.rs:246–267

(&self, q: &[f32])

    }

    fn prepare_query(&self, q: &[f32]) -> BbqQuery {
        let mut centered = Vec::with_capacity(self.dim);
        self.center(q, &mut centered);
        let signs = Self::pack_signs(&centered);
        let query_norm = Self::norm(&centered);
        let sign_fp: Vec<f32> = centered
            .iter()
            .map(|&x| if x >= 0.0 { 1.0 } else { -1.0 })
            .collect();
        let dot_vs = Self::dot(&centered, &sign_fp);
        let query_dot_quantized = if query_norm > 0.0 {
            dot_vs / query_norm
        } else {
            0.0
        };
        BbqQuery {
            centered,
            signs,
            query_norm,
            query_dot_quantized,
        }
    }

    /// Fast Hamming-based symmetric distance estimate.
    ///