fix gpu device bug in split_table_batched_embeddings_benchmark #590
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Summary: Bug in get_device() function, where on a gpu machine (torch.cuda.is_available() == True) it returns torch.cuda.current_device instead of torch.cuda.current_device(). Therefore the return value for get_device() ends up being a function rather than a torch.device, causing the benchmark to crash at the first instance of device placement based on get_device().
Reviewed By: bilgeacun, jianyuh
Differential Revision: D27606621