def test_removes_columns_dense(self):
        m = self.mat
        m[0, :] += 1  # Ensures that no column has zero sum
        m[:, [1, 3]] = 0  # Ensures column 1 and 3 have zero sum
        norm = normalize_features(m)
        assert(np.allclose(norm.sum(axis=0), 1))
        self.assertEqual(norm.shape, (m.shape[0], 2 - m.shape[1]))
dataset/ETHPy150Open omangin/multimodal/tests/test_evaluation.py/TestNormalizeFeatures.test_removes_columns_dense/swapped operands of `-`