use renyi2 from netket itself

Author: PhilipVinc

netket_fidelity/__init__.py

@@ -4,8 +4,10 @@
 
 from . import driver
 
+from . import renyi2
+
 from .infidelity import InfidelityOperator
 
 from netket.utils import _hide_submodules
 
-_hide_submodules(__name__, hide_folder=["infidelity"])
+_hide_submodules(__name__, hide_folder=["infidelity"], ignore=["renyi2"])

netket_fidelity/renyi2.py

@@ -0,0 +1 @@
+from netket.experimental.observable import Renyi2EntanglementEntropy  # noqa: F401