Discussion
Assertion (A): A surrogate model's predictions should be checked with the full analysis before deciding.
Reason (R): Its accuracy holds only within the region from which it was fitted.
Select the correct answer from the options below.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is why the check matters. A surrogate is fitted to a sample of full analyses and interpolates well within the region those samples cover; outside it, or in a corner where the sampling was sparse, its predictions can be badly wrong and it gives no warning. Optimisers are drawn precisely to extremes, so the design a surrogate search recommends is often exactly where its accuracy is least trustworthy.
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