code: def cosine_distant(vector1, vector2):
      
      vector1 = np.mat(vector1)
      vector2 = np.mat(vector2)
      vector1_norm = np.linalg.norm(vector1)
      vector2_norm = np.linalg.norm(vector2)
      dot_norm = vector1_norm * vector2_norm
      dot_vs = np.dot(vector1, vector2)
      return np.divide(dot_vs, dot_norm).item()
docs: 余弦距离