fix: deep copy nuts_sampler_kwarg to prevent .pop side effects

[inclinedadarsh]

Description

Deep copy the nuts_sampler_kwargs to prevent the function (.pop method) mutating the original passed dictonary.

Related Issue

• Closes Use of dict.pop in pm.sample leads to side effects #7632

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):

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📚 Documentation preview 📚: https://pymc--7652.org.readthedocs.build/en/7652/

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[ricardoV94]

The kwargs.pop in sample is fine, because it comes from **kwargs, it doesn't need any copy.

The only one that needs is the nuts_sample_kwargs, and only in the nutpie branch before we start popping it.
Just add the nuts_sampler_kwargs = nuts_sampler_kwargs.copy() line here:

pymc/pymc/sampling/mcmc.py

Line 341 in e6c5b1a

compile_kwargs = {}

[inclinedadarsh]

Thank you for correcting me, @ricardoV94; it means a lot to me.
I now understand why we just need the copy in the nutpie branch.

Thank you!

[ricardoV94]

Thanks @inclinedadarsh

Once the tests pass we can merge