Checking gradient ...

   analytic   diffs     delta

   -6.7439   -6.7439    0.0000
    2.1897    2.1897   -0.0000
   -2.3321   -2.3321   -0.0000

 TolFun reached. Func-count 19. Final f(x)=16.4578. Elapsed time 0.19

 gp hyperparameters: 
 
    1.6749   -0.3565   -1.4619

Demo completed in 0.009 minutes
