I added an additional function kn in the pytensor/tensor/math.py file which just calls kv function under the hood. This is to provide functionality similar to that offered by scipy.special.kn.

Description

scipy has two functions for computing modified Bessel functions of the second kind: scipy.special.kv (which works for functions of real order) and scipy.special.kn (which works for functions of integer order). pytensor has a function pytensor.tensor.kv which is similar to scipy, but it lacks a kn counterpart. Thus I added an extra helper function kn which just calls kv under the hood, as kv also works for integers.

Related Issue

• Closes Add helper for special.kn that just calls special.kv under the hood #1308
• Related to #

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://pytensor--1313.org.readthedocs.build/en/1313/