code: def transform_data(self, X, test_data=False):
          
          return self.warping_function.f(X, test_data)
docs: Apply warping_function to some Input data
  
          Parameters
          ----------
          X : array_like, shape = (n_samples, n_features)
  
          test_data: bool, optional
              Default to False, should set to True when transforming test data