multi-node offline DP+EP example

[youkaichao]

to make it easy to run multi-node DP+EP.

I have verified that the following command works:

# node 0
python examples/offline_inference/data_parallel.py --node-size 2 --node-rank 0 --master-addr 10.99.48.128 --master-port 13345
# node 1
python examples/offline_inference/data_parallel.py --node-size 2 --node-rank 1 --master-addr 10.99.48.128 --master-port 13345

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[tlrmchlsmth]

Could you update the usage line at the start of the file to show how to use it in the multinode case

[youkaichao]

Could you update the usage line at the start of the file to show how to use it in the multinode case

fixed in 9a196ae