fix(frontend-python): assigning signed values to unsigned tensors

frontends/concrete-python/concrete/fhe/mlir/context.py

@@ -1559,6 +1559,7 @@ class Context:
             np.broadcast_to(np.zeros(y.shape), required_y_shape)
             y = self.broadcast_to(y, required_y_shape)
 
+        x = self.to_signedness(x, of=resulting_type)
         y = self.to_signedness(y, of=resulting_type)
 
         return self.operation(

frontends/concrete-python/tests/conftest.py

@@ -5,6 +5,7 @@ Configuration of `pytest`.
 import json
 import os
 import random
+from copy import deepcopy
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Tuple, Union
 
@@ -295,8 +296,8 @@ class Helpers:
 
         if not only_simulation:
             for i in range(retries):
-                expected = sanitize(function(*sample))
-                actual = sanitize(circuit.encrypt_run_decrypt(*sample))
+                expected = sanitize(function(*deepcopy(sample)))
+                actual = sanitize(circuit.encrypt_run_decrypt(*deepcopy(sample)))
 
                 if all(np.array_equal(e, a) for e, a in zip(expected, actual)):
                     break
@@ -317,8 +318,8 @@ class Helpers:
 
         circuit.enable_fhe_simulation()
         for i in range(retries):
-            expected = sanitize(function(*sample))
-            actual = sanitize(circuit.simulate(*sample))
+            expected = sanitize(function(*deepcopy(sample)))
+            actual = sanitize(circuit.simulate(*deepcopy(sample)))
 
             if all(np.array_equal(e, a) for e, a in zip(expected, actual)):
                 break

frontends/concrete-python/tests/execution/test_static_assignment.py

@@ -443,6 +443,21 @@ def assignment_case_28():
     return shape, assign
 
 
+def assignment_case_29():
+    """
+    Assignment test case.
+    """
+
+    shape = (5,)
+    value = -20
+
+    def assign(x):
+        x[0] = value
+        return x
+
+    return shape, assign
+
+
 @pytest.mark.parametrize(
     "shape,function",
     [
@@ -475,6 +490,7 @@ def assignment_case_28():
         pytest.param(*assignment_case_26()),
         pytest.param(*assignment_case_27()),
         pytest.param(*assignment_case_28()),
+        pytest.param(*assignment_case_29()),
     ],
 )
 def test_static_assignment(shape, function, helpers):