Add transform_coords abstract method. SimplexTransform drops last coo…

[AndrewKillion]

Description

• Add abstract transform_coords method to Transform base class
• Implement method in all concrete Transform classes
• SimplexTransform and SumTo1 remove last coordinate
• Most other transforms preserve coordinates
• Add comprehensive test suite

Related Issue

• Closes #
• Related to Add transform_coords method to Transform method to automatically label unconstrained draws #7907

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

---

📚 Documentation preview 📚: https://pymc--7913.org.readthedocs.build/en/7913/

[welcome]

]
💖 Thanks for opening this pull request! 💖 The PyMC community really appreciates your time and effort to contribute to the project. Please make sure you have read our Contributing Guidelines and filled in our pull request template to the best of your ability.

[jessegrabowski]

Thanks for opening this!

Docs are failing because you missed adding transform_coords to a few transformers. My suggestion would actually be to use multiple inheritance in this case, we can have a OneToOneTransformerMixin class that just defines transform_coords(coords): return coords, and you can use that everywhere.

[ricardoV94]

OneToOneTransformerMixin class that just defines transform_coords(coords): return coords, and you can use that everywhere.

Have a subclass of Transform that behaves like that, and use that? Why mixin?

[ricardoV94]

Actually all these with ndim_supp=0, are those cases. Scalar transforms that don't modify coords