def test__rmatmul__(self):
        """Test reverse matmul operation on a variable."""
        v1 = backend.Variable(initializer=np.array([[1.0, 2.0], [3.0, 4.0]]))
        v2 = backend.Variable(initializer=np.array([[5.0, 6.0], [7.0, 8.0]]))
        self.assertAllClose(
            v1.__rmatmul__(v2), np.array([[23.0, 34.0], [31.0, 46.0]])
        )
Test reverse matmul operation on a variable.
keras/src/backend/common/variables_test.py