From 6074154548912d137a6cfcc64ebaa847b44eed8e Mon Sep 17 00:00:00 2001
From: Matthias Feurer <feurerm@informatik.uni-freiburg.de>
Date: Thu, 10 Sep 2020 14:09:49 +0200
Subject: [PATCH] add that None is forbidden in categorical and ordinal
 hyperparameters

---
 ConfigSpace/hyperparameters.pyx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ConfigSpace/hyperparameters.pyx b/ConfigSpace/hyperparameters.pyx
index 834b1959..28ecb266 100644
--- a/ConfigSpace/hyperparameters.pyx
+++ b/ConfigSpace/hyperparameters.pyx
@@ -1243,6 +1243,10 @@ cdef class CategoricalHyperparameter(Hyperparameter):
 
         Its values are sampled from a set of ``values``.
 
+        ``None`` is a forbidden value, please use a string constant instead and parse
+        it in your own code, see `here <https://github.com/automl/ConfigSpace/issues/159>_`
+        for further details.
+
         Example
         -------
 
@@ -1504,6 +1508,10 @@ cdef class OrdinalHyperparameter(Hyperparameter):
         Its values are sampled form a ``sequence`` of values.
         The sequence of values from a ordinal hyperparameter is ordered.
 
+        ``None`` is a forbidden value, please use a string constant instead and parse
+        it in your own code, see `here <https://github.com/automl/ConfigSpace/issues/159>_`
+        for further details.
+
         Example
         -------