Deprecate SumTo1 Transform

[ricardoV94]

Description

This seems to be an old transform that was replaced by the Simplex transform.

[PulsatingGenius]

i want to work on this issue .

[twiecki]

@PulsatingGenius Great, just open a PR (can be draft too).

[nyeshlur]

Hello if this issue is not currently being worked on I would like to work on it. I was wondering what needs to be included in a draft pull request?

[ricardoV94]

For now just a FutureWarning when users access the transform to let them know it's deprecated and will be removed in the future

Plus a test that verified the warning is working but you can still access it

[nyeshlur]

Hi so I have created a FutureWarning in pymc/distributions/transforms.py and I have written a test in tests/distributions/test_transform.py. I'm not sure if this is what is needed and I'm also unsure of how to run the test. Any help is appreciated.

[ricardoV94]

Thanks, I'll take a look but in the meantime this may give you some hints: https://www.pymc.io/projects/docs/en/stable/contributing/running_the_test_suite.html