code: def proximal(self):
          
          return proximal_convex_conj(proximal_convex_conj_kl_cross_entropy(
              space=self.domain, g=self.prior))
docs: Return the `proximal factory` of the functional.
  
          See Also
          --------
          odl.solvers.nonsmooth.proximal_operators.proximal_convex_conj_kl_cross_entropy :
              `proximal factory` for convex conjugate of the KL cross entropy.
          odl.solvers.nonsmooth.proximal_operators.proximal_convex_conj :
              Proximal of the convex conjugate of a functional.