code: def setup_method(self):
      self.true_poly = np.poly1d([-2, 3, 1, 5, -4])
      self.test_xs = np.linspace(-1, 1, 100)
      self.xs = np.linspace(-1, 1, 5)
      self.ys = self.true_poly(self.xs)
  
imports: import warnings
  import io
  import numpy
  from numpy.testing import assert_almost_equal, assert_array_equal, assert_array_almost_equal, assert_allclose, assert_equal, assert_
  from pytest import raises
  from scipy.interpolate import KroghInterpolator, krogh_interpolate, BarycentricInterpolator, barycentric_interpolate, approximate_taylor_polynomial, CubicHermiteSpline, pchip, PchipInterpolator, pchip_interpolate, Akima1DInterpolator, CubicSpline, make_interp_spline
label_desc: Use image node_id 1 for calling the TestKrogh obj's underlying member method code with example usage: obj.setup_method() without return types