Function cosineQuantized

src/context/sqlite-index.ts:85–97

(query: number[], q: QuantizedVec)

 * Running the dot product in a tight loop over the Int8Array is the hot path.
 */
export function cosineQuantized(query: number[], q: QuantizedVec): number {
  const { scale, bytes } = q;
  const len = Math.min(query.length, bytes.length);
  let dot = 0, nq = 0, ns = 0;
  for (let i = 0; i < len; i++) {
    const s = bytes[i]! * scale;
    dot += query[i]! * s;
    nq += query[i]! * query[i]!;
    ns += s * s;
  }
  if (nq === 0 || ns === 0) return 0;
  return dot / (Math.sqrt(nq) * Math.sqrt(ns));
}

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