code: def predict(self, a, b):
          
          a = np.array(a).reshape((-1, 1))
          b = np.array(b).reshape((-1, 1))
          return sp.kendalltau(a, b)[0]
docs: Compute the test statistic
  
          Args:
              a (array-like): Variable 1
              b (array-like): Variable 2
  
          Returns:
              float: test statistic