code: def homogene(
      k0: float, a0: float, pol: float, epsilon: float, n: int
  ) -> tp.Tuple[np.ndarray, np.ndarray]:
      nmod = int(n / 2)
      valp = np.sqrt(
          epsilon * k0 * k0
          - (a0 + 2 * np.pi * np.arange(-nmod, nmod + 1)) ** 2
          + 0j
      )
      valp = valp * (1 - 2 * (valp < 0))
      P = np.block(
          [[np.eye(n)], [np.diag(valp * (pol / epsilon + (1 - pol)))]]
      )
      return P, valp
  
file_path: nevergrad/nevergrad/functions/photonics/photonics.py
imports: import typing
  from pathlib import Path
  import numpy
  from scipy.linalg import toeplitz
label_desc: Use image node_id 7 for calling a global function with example usage: homogene(k0, a0, pol, epsilon, n) and returns: P,  valp