code: def test_inverse(self):
      # Check that antiderivative + derivative is identity.
      for n in range(5):
          spl2 = splantider(self.spl, n)
          spl3 = splder(spl2, n)
          assert_allclose(self.spl[0], spl3[0])
          assert_allclose(self.spl[1], spl3[1])
          assert_equal(self.spl[2], spl3[2])
  
imports: import itertools
  import os
  import numpy
  from numpy.testing import assert_equal, assert_allclose, assert_, assert_almost_equal, assert_array_almost_equal
  from pytest import raises
  import pytest
  from scipy._lib._testutils import check_free_memory
  from scipy.interpolate import RectBivariateSpline
  from scipy.interpolate._fitpack_py import splrep, splev, bisplrep, bisplev, sproot, splprep, splint, spalde, splder, splantider, insert, dblint
  from scipy.interpolate.dfitpack import regrid_smth
  from scipy.interpolate._fitpack2 import dfitpack_int
label_desc: Use image node_id 2 for calling the TestSplder obj's underlying member method code with example usage: obj.test_inverse() without return types