gpu训练

使用gpu训练的时候，显存有使用，但是gpu没有使用？使用的是CUDA_VISIBLE_DEVICES=0 python examples/hgcn/train.py 运行的hgcn. example

Start with examples/hgcn/train.py and reproduce the command CUDA_VISIBLE_DEVICES=0 python examples/hgcn/train.py. Check the training output and GPU monitoring while it runs to determine whether the reported memory use corresponds to active computation. Done means the cause is identified and GPU training behavior is clarified or corrected.

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