How to train on GPU 1, while leaving GPU 0?

Support
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Mine 1st GPU is Old Quadro, doesn’t support new PyTorch Version. Another one is new Tesla K40.
Just wants to start on GPU 1, instead 0.
I can’t remove old one as Tesla don’t have display port.

So how to train on only GPU 1, while leaving GPU 0 ?

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Duplicate of https://github.com/OpenNMT/OpenNMT-py/issues/1707

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