From 5f68d8a7c34a52b57be4d4cef44e646a81c2c931 Mon Sep 17 00:00:00 2001
From: Neil Lawrence <lawrennd@gmail.com>
Date: Wed, 19 May 2021 10:00:41 +0100
Subject: [PATCH] Fix normalizer to catch when output scale is zero.

---
 GPy/util/normalizer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/GPy/util/normalizer.py b/GPy/util/normalizer.py
index 83c79b32..243f81c7 100644
--- a/GPy/util/normalizer.py
+++ b/GPy/util/normalizer.py
@@ -4,7 +4,7 @@ Created on Aug 27, 2014
 @author: Max Zwiessele
 '''
 import numpy as np
-
+import warnings
 
 class _Norm(object):
     def __init__(self):