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https://github.com/tensorflow/hub/blob/master/examples/colab/tf2_image_retraining.ipynb 
Could not find tf2_image_retraining.ipynb in https://api.github.com/repos/tensorflow/hub/contents/examples/colab?per_page=100&ref=master
CustomError: Could not find tf2_image_retraining.ipynb in https://api.github.com/repos/tensorflow/hub/contents/examples/colab?per_page=100&ref=master
    at new jN (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:2472:68)
    at wa.program_ (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:2459:442)
    at za (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:16:57)
    at wa.next_ (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__zh_cn.js:17:309)
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