code: def setup_method(self):
      # non-uniform grid, just to make it sure
      x = np.linspace(0, 1, 100) ** 3
      y = np.sin(20 * x)
      self.spl = splrep(x, y)
  
      # double check that knots are non-uniform
      assert_(np.ptp(np.diff(self.spl[0])) > 0)
  
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 1 for calling the TestSplder obj's underlying member method code with example usage: obj.setup_method() without return types