def METHOD_NAME(self):
    # Frobenius norm is the default
    assert_allclose(spnorm(self.b), 7.745966692414834)        
    assert_allclose(spnorm(self.b, 'fro'), 7.745966692414834)
    assert_allclose(spnorm(self.b, np.inf), 9)
    assert_allclose(spnorm(self.b, -np.inf), 2)
    assert_allclose(spnorm(self.b, 1), 7)
    assert_allclose(spnorm(self.b, -1), 6)
    # _multi_svd_norm is not implemented for sparse matrix
    assert_raises(NotImplementedError, spnorm, self.b, 2)
    assert_raises(NotImplementedError, spnorm, self.b, -2)