Lesson 3 Planet Error : Temporary failure in name resolution

Part 1 (2019)
1

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Hi. I run the code accordingly as in the picture but an error occur on the line

learn = cnn_learner(data, arch)

(I omitted “metrics” because I was wondering whether it causes the error. But It seems that wasn’t the case)

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The last error line was "<urlopen error [Errno -3] Temporary failure in name resolution>"

Any help is appreciated !

PS. I have run this notebook in google colab and the error was not showing. But I switched to kaggle because the downloaded dataset on google colab notebook seemed to be deleted everytime I restart the session.

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I meet the same problem in kaggle.It seem like the restnet model can not download.