1 0 TAO, Function value: 0.00378251, Residual: 0.00101179 2 1 TAO, Function value: 1.21377e-06, Residual: 1.09216e-07 3 2 TAO, Function value: 1.21158e-06, Residual: 3.28103e-09 4relative reconstruction error: ||x-xGT||/||xGT|| = 4.3677e-01. 5