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Hi, this PR is out of date and will entirely be so once #346 is merged. As a result, I will close this but thank you for the PR!

However I was still wondering why there's a need for a dirac delta function, given this is equivalent to a Constant?

The idea was to autotune with ytopt using certain fixed values that might change later on. For example, autotuning the multiplication of a 32 x 32 matrix and a 32 x 1000 matrix at first and then later autotuning the multiplication of a 32 x 32 and 32 x 5000 matrix (but using the data from the first case to inform initial model).

I think I tried using Constant, but it either ConfigSpace or ytopt didn't like it when I changed the value of the Constant between executions. I ended up taking a different approach (essentially, only tuning the largest matrix dimensions).

Thanks for the use case! Would it ha e helped if you could easily copy and modify a Configuration space between executions? A lot of ConfigSpace relies on hyperparameter's attributes remaining fixed but there's no real API for mutating spaces or hyperparameter's which I guess might have helped here

Yeah, that likely would have been helpful.