(&self, q: &Self::Quantized, v: &Self::Quantized)
| 83 | /// INT8-INT8 Hamming estimate but SQ8 has no faster bitwise symmetric form. |
| 84 | #[inline] |
| 85 | fn fast_symmetric_distance(&self, q: &Self::Quantized, v: &Self::Quantized) -> f32 { |
| 86 | let qa = packed_bits_of(q); |
| 87 | let qb = packed_bits_of(v); |
| 88 | let dq_a = self.dequantize(qa); |
| 89 | let dq_b = self.dequantize(qb); |
| 90 | dq_a.iter() |
| 91 | .zip(dq_b.iter()) |
| 92 | .map(|(&a, &b)| { |
| 93 | let d = a - b; |
| 94 | d * d |
| 95 | }) |
| 96 | .sum() |
| 97 | } |
| 98 | |
| 99 | /// Asymmetric L2 squared distance: FP32 query vs INT8 candidate. |
| 100 | /// |