  Iteration information for tao_brgn_subsolver_ solve.
  0 TAO,  Function value: 0.00378251,  Residual: 0.00202357 
  1 TAO,  Function value: 5.54159e-05,  Residual: 9.39448e-05 
  2 TAO,  Function value: 6.97123e-06,  Residual: 2.87659e-05 
  3 TAO,  Function value: 1.5374e-06,  Residual: 9.12911e-06 
  4 TAO,  Function value: 7.98756e-07,  Residual: 2.21835e-06 
  5 TAO,  Function value: 7.28176e-07,  Residual: 2.33103e-07 
relative reconstruction error: ||x-xGT||/||xGT|| = 1.5583e-01.
