code: def test_delayed(self):
      P = BarycentricInterpolator(self.xs)
      P.set_yi(self.ys)
      assert_almost_equal(self.true_poly(self.test_xs), P(self.test_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 4 for calling the TestBarycentric obj's underlying member method code with example usage: obj.test_delayed() without return types