[FIX] adding missing import

.gitignore

@@ -11,6 +11,7 @@ __pycache__
 *.pyc
 *.egg-info
 dist*/
+py_env_aidge/
 
 # Mermaid
 *.mmd

aidge_backend_cpu/unit_tests/test_tensor.py

@@ -2,7 +2,7 @@ import unittest
 import aidge_core
 import aidge_backend_cpu
 import numpy as np
-
+from functools import reduce
 
 class test_tensor(unittest.TestCase):
     """Test tensor binding