Function quantize

src/context/sqlite-index.ts:68–78

(vec: number[])

/** Symmetric per-vector int8 quantization. */
export function quantize(vec: number[]): QuantizedVec {
  let max = 0;
  for (const v of vec) { const a = Math.abs(v); if (a > max) max = a; }
  const scale = max === 0 ? 1 : max / 127;
  const bytes = new Int8Array(vec.length);
  for (let i = 0; i < vec.length; i++) {
    const q = Math.round(vec[i]! / scale);
    bytes[i] = q > 127 ? 127 : q < -127 ? -127 : q;
  }
  return { scale, bytes };
}

/**
 * Cosine similarity between a (full-precision) query vector and a quantized