conda create -n tf2 python=3.7
activate tf2
pip install tensorflow==2.1 -i https://pypi.tuna.tsinghua.edu.cn/simple
conda info --env
pip list

conda create -n tf2 python=3.7
activate tf2
pip install tensorflow==2.1 -i https://pypi.tuna.tsinghua.edu.cn/simple
conda info --env
pip list