[v1.x] Add onnx operator unit tests for sum, broadcast_mul

tests/python-pytest/onnx/test_operators.py

@@ -720,3 +720,25 @@ def test_onnx_export_batch_dot(tmp_path, dtype, transpose_a, transpose_b):
     y2 = mx.nd.random.normal(0, 10, (2, 3, 4, 5, 5), dtype=dtype)
     M2 = def_model('batch_dot', transpose_a=transpose_a, transpose_b=transpose_b)
     op_export_test('batch_dot2', M2, [x2, y2], tmp_path)
+
+
+@pytest.mark.parametrize('dtype', ['int32', 'int64', 'float16', 'float32', 'float64'])
+@pytest.mark.parametrize('axis', [None, 1, [1,2], -1])
+def test_onnx_export_sum(tmp_path, dtype, axis):
+    if 'int' in dtype:
+        x = mx.nd.random.randint(0, 10, (5, 6, 7, 8), dtype=dtype)
+    else:
+        x = mx.nd.random.normal(0, 10, (5, 6, 7, 8), dtype=dtype)
+    if axis is not None:
+        M = def_model('sum', axis=axis)
+    else:
+        M = def_model('sum')
+    op_export_test('sum', M, [x], tmp_path)
+
+
+@pytest.mark.parametrize('dtype', ['float16', 'float32', 'float64', 'int32', 'int64'])
+def test_onnx_export_broadcast_mul(tmp_path, dtype):
+    M = def_model('broadcast_mul')
+    x = mx.nd.array([[1,2,3],[4,5,6]], dtype=dtype)
+    y = mx.nd.array([[0],[3]], dtype=dtype)
+    op_export_test('broadcast_mul', M, [x, y], tmp_path)