Computes the cosine similarity between two vectors

npm install cos-similarity

Returns the cosine similarity between the given vectorA and vectorB. Returns 0 when given a zero vector, [], undefined or nothing.

import cosSimilarity from "cos-similarity";

cosSimilarity([1, 2, 4], [1, 0, 2]); // -> 0.8783100656536799
cosSimilarity([1, 2, 0], [1, 2, 0]); // -> 1
cosSimilarity([2, 0, 0], [0, 2, 0]); // -> 0
cosSimilarity([-1, -2, 0], [1, 2, 0]); // -> -1

To run the benchmark, clone the repositry and run the bench script:

npm run bench

benchmark                        time (avg)             (min … max)
-------------------------------------------------------------------
• cosine similarity modules
-------------------------------------------------------------------
cos-similarity                  249 ns/iter       (247 ns … 319 ns)
compute-cosine-similarity       854 ns/iter       (829 ns … 428 µs)
cosine-similarity            14'251 ns/iter    (13'680 ns … 229 µs)
cosine-similarity-threshold     879 ns/iter       (802 ns … 310 µs)

summary for cosine similarity modules
  cos-similarity
   3.43x faster than compute-cosine-similarity
   3.53x faster than cosine-similarity-threshold
   57.25x faster than cosine-similarity