resolving issue #1384

#export tensorflow=tensorflow-gpu

export tensorflow=tensorflow

if [ -z "$gpu" ]

then

    export tensorflow=tensorflow

    echo "Using Tensorflow (CPU MODE) by default."

elif [ "$gpu" == 1 ]

then

    export tensorflow=tensorflow-gpu

    echo "Using Tensorflow (GPU MODE)."

else

    echo "Using Tensorflow (CPU MODE) by default."

fi

if [ -z "$python_version" ]

then

    echo "Using python 3.5 by default"

    export python_version=3.5

else

    echo "Using python "$python_version". But recommended to use python 3.5."

fi

if [ -z "$1" ];