 Iteration  Func-count   Grad-count         f(x)         Step-size
     0           1           1             2964.84    
     1           2           2             2908.76       0.0146046
     2           4           4             2900.33             0.1
     3           5           5             2885.72               1
     4           7           7              2864.1        0.295668
     5           8           8             2848.64               1
     6           9           9             2842.71               1
     7          10          10             2842.05               1
     8          12          12             2841.84        0.266463
     9          14          14             2841.81        0.143598
    10          15          15             2841.77               1
    11          16          16             2841.71               1
    12          17          17              2841.7               1
    13          18          18             2841.69               1
    14          19          19             2841.69               1
 Optimizer Results
  Algorithm Used: Broyden-Fletcher-Goldfarb-Shanno (BFGS)
  Exit message : Change in x was smaller than the specified tolerance TolX.
  Iterations : 15
  Function Count : 20
  Minimum found : 2841.6901
  Intern Time : 0.017685 seconds
  Total Time : 102.8869 seconds

 gp hyperparameters: 
 
    4.0478    1.3173   -2.6332    1.4244

Demo completed in 1.745 minutes
