Multiple dimensional sampling with first element string

Specific Domains Optimization (Mathematical)
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I’m trying to condense your problem into a minimal working example (MWE), see here Please read: make it easier to help you for how to structure questions that are easy to understand.

It is not certain that I can help, but I can help to simplify your question, at least.

So most of your code plays no part here. I reduced your example to this:

using Surrogates
x_train = sample(10, ["s1", 1], ["s4", 10], SobolSample())

This gives an error:

ERROR: MethodError: no method matching +(::String, ::Int64)

But you are saying that this is no longer a problem, and your code now fails at the next line:

instead?

How did you get the x_train?

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