Added an option scale_params to scale the parameters in GP space using min max scaler. Using 10 repeated test_six_hump test with param y scaled by a factor of 1000 we get the following results:
Base case (y param not scaled in inputs or GP space): 0 out of 10 tests failed Y param not scaled, GP space scaled: 1 out of 10 tests failed Without scaling GP space: 0 out of 10 tests failed With scaling GP space: 2 out of 10 tests failed
Scaling is not clearly useful so not exposing it as an option.