Dependences
    1. numpy, scipy
        sudo apt-get install python-dev, python-numpy, python-scipy
    2. skimage
        sudo apt-get install python-skimage  or  pip install scikit-image
    3. sklearn
        sudo apt-get install python-sklearn  or  pip install scikit-learn
    4. opencv
        sudo apt-get install python-opencv
    5. tensorflow
        url: https://www.tensorflow.org/install/