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Support string based GPU ids #239
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GPU device ids can be specified with an integer index, but may also be specified as strings.
This PR ensures that both cases are supported by
root_device. The code is taken from what is being done in Ray Train: https://sourcegraph.com/github.com/ray-project/ray/-/blob/python/ray/train/torch/train_loop_utils.py?L470-498Closes #236