code: def test_impedence_pix() -> None:
      ep0 = 1
      epf = 9
      x = np.array([3.0, 5.0, 1.0, 9.0])
      dpix = 37
      lam = 400
      output = core.impedance_pix(x, dpix, lam, ep0, epf)
      np.testing.assert_almost_equal(output, 46.64, decimal=2)
  
file_path: nevergrad/nevergrad/functions/arcoating/test_core.py
imports: import typing
  import numpy
  import nevergrad
  from .None import core
label_desc: Use image node_id 1 for calling a global function with example usage: test_impedence_pix() without return types