code: public static double cosineSim(@NonNull INDArray d1, @NonNull INDArray d2) {
          return Nd4j.getExecutioner().exec(new CosineSimilarity(d1, d2)).getDouble(0);
      }
docs: Cosine similarity
  
  @param d1 the first vector
  @param d2 the second vector
  @return the cosine similarities between the 2 arrays