Se produjo un error al cargar este bloc de notas. Asegúrate de que se pueda acceder al archivo y vuelve a intentarlo.

Asegúrate de tener permiso para ver este notebook en GitHub y autoriza a Colab para usar la API de GitHub.

https://github.com/flutter/codelabs/blob/master/tfrs-flutter/step1/backend/retrieval/retrieval.ipynb 
Fetch for https://api.github.com/repos/flutter/codelabs/contents/tfrs-flutter/step1/backend/retrieval?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"}
CustomError: Fetch for https://api.github.com/repos/flutter/codelabs/contents/tfrs-flutter/step1/backend/retrieval?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 jN (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:2458:68)
    at wa.program_ (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:2441:436)
    at za (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:16:57)
    at wa.next_ (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:14:195)
    at kaa.next (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:17:48)
    at b (https://ssl.gstatic.com/colaboratory-static/common/629c0c0894a411e1c2ceca4f346d8829/external_binary_l10n__es_419.js:17:309)
 Autorizar con GitHub