From 2517ab53fbcc7c98316a48a2295860cf45f43206 Mon Sep 17 00:00:00 2001
From: Pablo Andres-Martinez <pablo.andresmartinez@quantinuum.com>
Date: Tue, 3 Oct 2023 16:00:40 -0700
Subject: [PATCH] Warning now using warnings module

---
 pytket/extensions/cutensornet/mps/mps.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pytket/extensions/cutensornet/mps/mps.py b/pytket/extensions/cutensornet/mps/mps.py
index 762958cc..a5f40f64 100644
--- a/pytket/extensions/cutensornet/mps/mps.py
+++ b/pytket/extensions/cutensornet/mps/mps.py
@@ -174,9 +174,10 @@ def __init__(
         self.zero = value_of_zero
 
         if value_of_zero > self._atol / 1000:
-            logging.warning(
+            warnings.warn(
                 "Your chosen value_of_zero is relatively large. "
-                "Faithfulness of final fidelity estimate is not guaranteed."
+                "Faithfulness of final fidelity estimate is not guaranteed.",
+                UserWarning,
             )
 
         self.k = k