修改镜像源为国内源，方便快速下载
直接创建环境，并下载tensorflow-gpu
conda create -n tf2 tensorflow-gpu
激活环境
source activate
conda activate tf2
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修改镜像源为国内源，方便快速下载
直接创建环境，并下载tensorflow-gpu
conda create -n tf2 tensorflow-gpu
激活环境
source activate
conda activate tf2