Support for multy GPUs

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System Info / 系統信息

AWS EC2 V100 x 4

Information / 问题信息

• [X] The official example scripts / 官方的示例脚本
• [X] My own modified scripts / 我自己修改的脚本和任务

Reproduction / 复现过程

The code has been modified but it still says

Expected behavior / 期待表现

Fixed the bug

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the cli_demo.py

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check the comment in this code,remove cpu_offload,