Rework GPU API #2821
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Rework GPU API #2821
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Follow up to #2790.
This PR reworks our GPU API around pynvml to be easier to work with and more error resistant. The main change is that the
gpumodule now exports a singlenvidiaobject. This object simply holds a list of all Nvidia devices. If the list is empty, thennvidia.is_availableis false. This gives us a pretty simple OO API, which closely models the nvml API.