EuroSAT: fix SSL certificate issues

[adamjstewart]

When downloading the EuroSAT dataset, users encounter the following error message:

> python3
>>> from torchvision.datasets import EuroSAT
>>> EuroSAT('data', download=True)
...
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1006)>

This leads a lot of users to dangerous StackOverflow suggestions to disable SSL verification entirely.

This PR switches the download URL to a stable mirror of the download on Hugging Face. This dataset was rehosted with permission from the original author of EuroSAT: phelber/EuroSAT#10. The zip file is unmodified and has the same MD5 and SHA256 checksums.

Also added a link to a data loader for the multispectral (MS) version of the dataset for any other remote sensing researchers who need it.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8563

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❌ 7 New Failures, 2 Unrelated Failures

As of commit e135137 with merge base c8c496d ():

NEW FAILURES - The following jobs have failed:

• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
  Process completed with exit code 4.
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Tests / unittests-linux (3.8, linux.12xlarge, cpu) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128

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[adamjstewart]

Could use hf.co or main to make this URL shorter if you want. I don't plan on modifying this file, but the commit hash ensures that even if I do, the checksum still works.

[NicolasHug]

Thanks a lot @adamjstewart

[adamjstewart]

Are the prototype datasets being abandoned?

[NicolasHug]

Yes, pretty much (https://github.com/pytorch/vision/tree/main/torchvision/prototype/datasets).
The underlying datapipes are being deprecated as well pytorch/data#1196 (comment)