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https://github.com/bentoml/gallery/blob/master/tensorflow/echo/tensorflow-echo.ipynb 
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CustomError: Fetch for https://api.github.com/repos/bentoml/gallery/contents/tensorflow/echo?per_page=100&ref=master failed: {"message":"No commit found for the ref master","documentation_url":"https://docs.github.com/v3/repos/contents/","status":"404"}
    at new sM (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:2450:68)
    at va.program_ (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:2433:436)
    at xa (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:16:57)
    at va.next_ (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/c3b8c7dca2abfd16eb021f6c96299a7e/external_binary.js:17:309)
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