1 files changed, 45 insertions, 0 deletions
diff --git a/tests/test_nn_rewrite_core_graph_edit_diff.py b/tests/test_nn_rewrite_core_graph_edit_diff.py
new file mode 100644
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--- /dev/null
+++ b/tests/test_nn_rewrite_core_graph_edit_diff.py
@@ -0,0 +1,45 @@
+# SPDX-FileCopyrightText: Copyright 2023, Arm Limited and/or its affiliates.
+# SPDX-License-Identifier: Apache-2.0
+"""Tests for module mlia.nn.rewrite.graph_edit.join."""
+from pathlib import Path
+
+import numpy as np
+import pytest
+
+from mlia.nn.rewrite.core.graph_edit.diff import calc_nrmse
+from mlia.nn.rewrite.core.graph_edit.diff import diff_stats
+
+
+def assert_two_dictionaries_with_numpy_arrays(dict1: dict, dict2: dict) -> None:
+    """Use numpy assertions to check whether two dictionaries are equal."""
+    key1, val1 = list(dict1.keys()), list(dict1.values())
+    key2, val2 = list(dict2.keys()), list(dict2.values())
+    np.testing.assert_equal(key1, key2)
+    np.testing.assert_almost_equal(val1, val2)
+
+
+@pytest.mark.parametrize(
+    "rmse, scale, expected_result",
+    [
+        (
+            {"test1": np.ndarray((3,), buffer=np.array([1.0, 2.0, 3.3]))},
+            {"test1": np.ndarray((3,), buffer=np.array([4.0, 4.0, 0.0]))},
+            {"test1": np.ndarray((3,), buffer=np.array([0.5, 1.0, 3.3]))},
+        ),
+        (
+            {"test1": np.ndarray((3,), buffer=np.array([1.0, 2.0, 3.3]))},
+            {"test1": np.ndarray((3,), buffer=np.array([0.0, 0.0, 0.0]))},
+            {"test1": np.ndarray((3,), buffer=np.array([1.0, 2.0, 3.3]))},
+        ),
+    ],
+)
+def test_calc_nrmse(rmse: dict, scale: dict, expected_result: dict) -> None:
+    """Test calc_nrmse() function."""
+    assert_two_dictionaries_with_numpy_arrays(calc_nrmse(rmse, scale), expected_result)
+
+
+def test_diff_stats(test_tfrecord_fp32: Path) -> None:
+    """Test diff_stats() function."""
+    res1, res2 = diff_stats(test_tfrecord_fp32, test_tfrecord_fp32)
+    assert res1 == 0.0
+    assert res2 == 0.0