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https://github.com/tensorflow/docs/blob/master/site/en/r2/tutorials/generative/image_captioning.ipynb 
Fetch for https://api.github.com/repos/tensorflow/docs/contents/site/en/r2/tutorials/generative?per_page=100&ref=master failed: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/repos/contents#get-repository-content","status":"404"}
CustomError: Fetch for https://api.github.com/repos/tensorflow/docs/contents/site/en/r2/tutorials/generative?per_page=100&ref=master failed: {"message":"Not Found","documentation_url":"https://docs.github.com/rest/repos/contents#get-repository-content","status":"404"}
    at new oM (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:2445:68)
    at va.program_ (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:2428:436)
    at ya (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:16:57)
    at va.next_ (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/52ab59d64d72e779f904e6e0df6356b0/external_binary.js:17:309)
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