Estimating model bias over the complete nuclide chart with sparse Gaussian processes at the example of INCL/ABLA and double-differential neutron spectra

Special Issue on 4th International Workshop on Nuclear Data Covariances, October 2–6, 2017, Aix en Provence, France – CW2017

Open Access

Table 2

Setup of the L-BFGS-B optimization and evolution of hyperparameters. The columns LB and UB give the lower bound and upper bound, respectively, of the parameter ranges. Columns It indicate the parameter values after i × 1000 iterations. The column It₀ contains initial values and It_f the final values after 3500 iterations.

LB	UB	It₀	It₁	It₂	It₃	It_f
0.01	0.50	0.05	0.50	0.50	0.50	0.50
50	1000	100	100	99	99	99
10	300	100	100	101	103	103
10	200	40	39	39	40	41
10	179	50	51	57	66	68
2	1000	20.0	7.3	5.0	4.7	4.8
0.01	0.50	0.40	0.33	0.34	0.33	0.33
50	1000	300	292	285	275	272
10	300	100	107	110	114	115
10	200	40	49	50	50	49
10	179	50	62	63	64	64
10	1000	20	40	41	42	43
0.1	20	0.2	0.4	0.4	0.3	0.3
2.0	500	6.0	2.6	2.3	2.4	2.8
1.0	2.1	1.6	1.6	1.6	1.6	1.6

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