Support for multiple datasets

[andrrizzi]

Description

This PR adds support for multiple datasets in DictionaryDataModule and FastDictionaryLoader. I have also extended a bit the tests and the docstrings and added a couple of working doctest examples.

Status

• Ready to go

[codecov]

Codecov Report

Merging #45 (38b00d7) into lightning (0ca644c) will not change coverage.
The diff coverage is 0.00%.

[luigibonati]

That sounds good! if i understand it correctly now if you pass a single dataset the behaviour is the same as before, while if you pass a list of dataloaders it will return a dictionary of dictionaries ['dataset0': X, 'dataset1': Y], is this right?

for me you can merge it!

[andrrizzi]

if i understand it correctly now if you pass a single dataset the behaviour is the same as before, while if you pass a list of dataloaders it will return a dictionary of dictionaries ['dataset0': X, 'dataset1': Y], is this right?

Exactly right!

for me you can merge it!

Great! Merging then.