code: def test_vector(self):
      xs = [0, 1, 2]
      ys = np.array([[0, 1], [1, 0], [2, 1]])
      BI = BarycentricInterpolator
      P = BI(xs, ys)
      Pi = [BI(xs, ys[:, i]) for i in range(ys.shape[1])]
      test_xs = np.linspace(-1, 3, 100)
      assert_almost_equal(
          P(test_xs),
          np.rollaxis(np.asarray([p(test_xs) for p in Pi]), -1),
      )
  
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 6 for calling the TestBarycentric obj's underlying member method code with example usage: obj.test_vector() without return types