Merge branch 'master' into fix-binops

tests/test_matrix_variable.py

@@ -216,7 +216,7 @@ def test_matrix_sum_argument():
     assert (m.getVal(x) == np.full((2, 3), 4)).all().all()
     assert (m.getVal(y) == np.full((2, 4), 3)).all().all()
 
-
+@pytest.mark.skip(reason="Performance test")
 def test_sum_performance():
     n = 1000
     model = Model()