how to train the model use multiple machines through mpiexec

[wangsaisai716]

hi, thx to your great repo. I have a question about how to train a model use mpiexec I searched some infos from the Internet that https://gitee.com/mindspore/docs/blob/r1.2/tutorials/training/source_zh_cn/advanced_use/distributed_training_gpu.md. mpirun -n 16 --hosts DEVICE1_IP:8,DEVICE2_IP:8 -x DATA_PATH=$DATA_PATH. However, it doesn't work.