Fix run finetune.py from torch.distributed.launch

[iohub]

To fix the unrecognized arguments problem, when running finetune.py from torch.distributed.launch. the argument local_rank needs to be changed to local-rank.

launch command:

python -m torch.distributed.launch --nproc_per_node=2 finetune.py --model_path xxx ...

error log

finetune.py: error: unrecognized arguments: --local-rank=0