Small perf improvements

[Ch0ronomato]

Description

There was a warning about copying a tensor, this change removes that. In addition, until we decide to keep torch autograd going around, I disabled it here to free up a bit of memory during the runtime. This brought back about 80us back from the mean time in the best case.

Related Issue

• Closes #
• Related to Pytorch backend slow with pymc model #1110

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://pytensor--1128.org.readthedocs.build/en/1128/

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.10%. Comparing base (231a977) to head (8a3bf6a).

Files with missing lines	Patch %	Lines
pytensor/link/pytorch/dispatch/basic.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1128   +/-   ##
=======================================
  Coverage   82.10%   82.10%           
=======================================
  Files         185      185           
  Lines       48130    48133    +3     
  Branches     8669     8669           
=======================================
+ Hits        39519    39522    +3     
  Misses       6444     6444           
  Partials     2167     2167           

Files with missing lines	Coverage Δ
pytensor/link/pytorch/linker.py	100.00% <100.00%> (ø)
pytensor/link/pytorch/dispatch/basic.py	94.49% <0.00%> (ø)