Add resisc45 and update eurosat datasets

[normster]

Hi @QuentinDuval,

I implemented the RESISC45 dataset script and added random sampling to the eurosat dataset. OpenAI shared some details about these two datasets here but the 10% train split for RESISC45 is very small, so I just used the VTAB percentages, combining train + val into train.

Norman

[QuentinDuval]

Thanks a lot @normster !

That's an excellent contributions to VISSL, a very important dataset to have in the VISSL library.

I wrote a few comments as potential improvement, but it's great work overall.

Thanks again :)

[QuentinDuval]

Adding a few ideas that could be done inside this PR or in a different one:

• completing the dataset_catalog.json to have an (empty) entry for the dataset
• adding configuration files in the linear evaluation benchmarks folder to run a benchmark on this dataset

Feel free to complete this one if you want to tackle those or else we can manage it on our side afterwards.

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@normster has updated the pull request. You must reimport the pull request before landing.

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