1. pip3 use (python 3.x version) 1.1 tensorflow cpu version $ pip3 install tensorflow (uninstall $ pip3 uninstall tensorflow) 1.2 tensorflow gpu version $ pip3 install tensorflow-gpu (uninstall $ pip3 uninstall tensorflow-gpu) 2. pip use (python 2.x version) 2.1 tensorflow cpu version $ pip install tensorflow (uninstall $ pip uninstall tensorflow) 2.2 tensorflow gpu version $ pip install tensorf..