How to add CUDA as optional dependency?

Specific Domains GPU
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2

This is probably not what you are looking for but in principle you could split up your code into three parts: general, GPU-specific, and CPU-specific.

Then users could do something like:

using GeneralPackage, GPUPackage

result = GeneralPackage.calculate(inputs, GPUPackage.Engine())

or conversely

using GeneralPackage, CPUPackage

result = GeneralPackage.calculate(inputs, CPUPackage.Engine())