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运行以下样例之前，需要配置好通信环境变量。
针对Ascend/GPU/CPU设备，推荐使用msrun启动方式，无第三方以及配置文件依赖。详见 `msrun启动 <https://www.mindspore.cn/tutorials/zh-CN/master/parallel/msrun_launcher.html>`_ 。