Function cosine

test/demo/embeddings-proof.demo.mjs:90–91

(a, b)

      const dot12 = vectors[1].reduce((s, x, i) => s + x * vectors[2][i], 0);
      const norm = (v) => Math.sqrt(v.reduce((s, x) => s + x * x, 0));
      const cosine = (a, b) =>
        a.reduce((s, x, i) => s + x * b[i], 0) / (norm(a) * norm(b));

      console.log("\n  Cosine similarities:");
      console.log(