Move classes and public functions to top of files

[guarin]

Description

• Move classes and exported functions to top of file, move private functions to bottom
• Do this on a per subpackage basis

Private functions or classes start with an underscore:

• def _private_fun
• def _PrivateClass
• def public_fun
• def PublicClass

Exceptions are types/type aliases that should remain next to the function/class where they are used.

Tasks

• Move public classes and functions to top in lightly/data
• Move public classes and functions to top in lightly/loss
• Move public classes and functions to top in lightly/models/modules
• Move public classes and functions to top in lightly/transforms
• Move public classes and functions to top in lightly/utils

[moli-debugger]

@guarin I have moved the private func to bottom level for visibility and accessibility. kindly create a seprate issue for moving the private func to the bottom to the mentioned files and assign it to me.

1. lightly/models/byol.py
2. lightly/models/nnclr.py
3. lightly/models/utils.py

[guarin]

@moli-debugger thanks for looking into this! I created the issue here: #1671 I can assign it to you once you comment on it.

FYI the SSL models in lightly/models like model/simclr.py etc. are deprecated and will be removed in the next major version update. I'll update the issue description with a list of files that are most important to update.

[fadkeabhi]

I would also like to work on this issue, If there are any more files that need to be changed I would like to do it.

[guarin]

Hi @fadkeabhi, thanks for looking into this! I added some more directories to the issue description. Would you be interested on any of them?

[fadkeabhi]

@guarin Thank you for the opportunity. I will work on those directories. Will submit a PR regarding it soon.

[fadkeabhi]

@guarin I have submitted a PR for All the above mentioned directories. Take a look at it here #1685.
lightly/transforms did not need any changes as it was already cleaned.

[SauravMaheshkar]

Closing as completed in #1685