MNIST url update

[rmchurch]

🐛 Describe the bug

MNIST no longer downloading from LeCun website, according to him should update URL to HuggingFace
https://x.com/ylecun/status/1861178764996079752?t=i9U_SMktZgFKXGIAUbif4g&s=19

Versions

Any

[NicolasHug]

Thanks for the heads up @rmchurch .

Unfortunately torchvision cannot take a dependency on HF, and MNIST on HF is stored as a parquet file, which isn't something we can natively read (at least not with the current code-base). So I'm afraid it'll be tricky to directly integrate this new recommended URL within the existing code.

If we can download such files without depending on HF (or require an account) and if we can read the .parquet files without adding a new dep to torchvision, then I think we should be able to go ahead with the new URL.

If you know of an official mirror that could just be plug-and-play with the current ones, please do let me know!

vision/torchvision/datasets/mnist.py

Lines 37 to 41 in b33aef4

	mirrors = [
	"http://yann.lecun.com/exdb/mnist/",
	"https://ossci-datasets.s3.amazonaws.com/mnist/",
	]