I think you should add the doi.org to linkcheck_ignore but not 100% sure. To be sure you can try to run make linkcheck from the doc folder locally.

Thank you @lesteve, but actually I'm unable to run the make command, on Windows PowerShell I get this error message:

PS C:\Users\eliaa\Documents\GitHub\scikit-learn\doc> .\make
Running Sphinx v5.0.2

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "c:\python38\lib\site-packages\sphinx\config.py", line 343, in eval_config_file
    exec(code, namespace)
  File "C:\Users\eliaa\Documents\GitHub\scikit-learn\doc\conf.py", line 18, in <module>
    from sklearn.externals._packaging.version import parse
ModuleNotFoundError: No module named 'sklearn'

That is pretty funny since I'm working in the sklearn repo. Do you have any hint on how I can get rid of this? I tried searching online but I didn't find anything useful...sorry to bother you

Thank you @lesteve, but actually I'm unable to run the make command, on Windows PowerShell I get this error message:

PS C:\Users\eliaa\Documents\GitHub\scikit-learn\doc> .\make
Running Sphinx v5.0.2

Configuration error:
There is a programmable error in your configuration file:

Traceback (most recent call last):
  File "c:\python38\lib\site-packages\sphinx\config.py", line 343, in eval_config_file
    exec(code, namespace)
  File "C:\Users\eliaa\Documents\GitHub\scikit-learn\doc\conf.py", line 18, in <module>
    from sklearn.externals._packaging.version import parse
ModuleNotFoundError: No module named 'sklearn'

That is pretty funny since I'm working in the sklearn repo. Do you have any hint on how I can get rid of this? I tried searching online but I didn't find anything useful...sorry to bother you

Solved. It turned out that the build didn't go well when I first ran it. Now the command is running correctly

At the end of day you were right, gonna fix it tomorrow :)

I solved the conflicts and pushed a minor tweak into your branch, thanks a lot, merging!

General advice: create a branch to create a pull request from, rather than using your main branch. You can look at https://docs.github.com/en/get-started/quickstart/github-flow#create-a-branch for more details.

Thank you @lesteve ! Yes, I know, my bad 😅