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* Change default of download for Food101 and DTD

* Set download default to False and put it at the end

* Keep stuff private

* GTSRB: train -> split. Also use pathlib

* mypy

* Remove split and partition for SUN397

* mypy

* mypy

* move download param for SST2

* Use make_dataset in SST2

* Use a base URL for GTSRB

* Let's make this code more complictaed than it needs to be because why not

* Add Country211 dataset

To addresses issue #5108.

* Add Country211 dataset

To addresses issue #5108.

* Update country211.py

* Update country211.py

* Code review reflected

Reflect code review

* Update test_datasets.py

* Update with review

Update with review

* inherit from ImageFolder

* Update test/test_datasets.py

* Docstring + minor test update
Co-authored-by: Philip Meier <github.pmeier@posteo.de>
Co-authored-by: Nicolas Hug <nicolashug@fb.com>