Update argument types to use Optional whenever possible

lightly-ai / lightly

A python library for self-supervised learning on images.

https://docs.lightly.ai/self-supervised-learning/

MIT License

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Update argument types to use Optional whenever possible #1495

Closed otavioon closed 5 months ago

otavioon commented 5 months ago

Python typing hints employ the Optional operator, a shorthand notation for Union[..., None]. While some parts of this project use this shorthand notation, others opt to use Union[..., None]. This PR standardizes the typing hints to use Optional whenever None is the default argument. This enhances the readability of the code in the repository.

guarin commented 5 months ago

Thanks a lot for the PR! The changes look good, will merge once the tests pass :)