Auto-detect device for easier getting started #211
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When I tried to run the example to get started with the project, I was stopped by an error: "Torch not compiled with CUDA enabled. ", which comes from my MacBook's lack of a CUDA device. I added an auto-detection feature for the device parameter, so that a new developer without a CUDA device can get started more smoothly.
The requirement of torch>=2.0.0 is to avoid another compile error due to the version of PyTorch.