code: def test_lagrange(self, xp, scp, dtype):
      if xp.dtype(dtype).kind in "u":
          pytest.skip()
      true_poly = xp.poly1d([-2, 3, 1, 5, -4])
      test_xs = xp.linspace(-5, 5, 5, dtype=dtype)
      xs = xp.linspace(-1, 1, 5, dtype=dtype)
      ys = true_poly(xs)
      P = scp.interpolate.KroghInterpolator(xs, ys)
      out = P(test_xs)
      print(out.dtype)
      return out
  
imports: import io
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy.cuda import runtime
  from cupy import testing
  import cupyx.scipy.interpolate
  from cupyx.scipy.interpolate import CubicHermiteSpline
label_desc: Use image node_id 1 for calling the TestKrogh obj's underlying member method code with example usage: obj.test_lagrange(xp, scp, dtype) and returns: out