fix: lazy load jailbreak detection dependencies

[jeffreyscarpenter]

Description

Fixes #1222 by making jailbreak detection dependencies lazy-loaded. This means torch, transformers, and sklearn are only imported when using the local model-based approach, not when using the NIM-based approach.

Related Issue(s)

Fixes #1222

Checklist

• I've read the CONTRIBUTING guidelines.
• I've updated the documentation if applicable.
• I've added tests if applicable.
• @mentions of the person or team responsible for reviewing proposed changes.

[cparisien]

I'm ok with this. Will need @erickgalinkin to ensure current test coverage is sufficient.

[erickgalinkin]

This looks great to me! Thanks for the suggestion @jeffreyscarpenter !

[tgasser-nv]

Looks good, could you add tests to ensure the correct modules are imported and the functions still work as before?

[jeffreyscarpenter]

Looks good, could you add tests to ensure the correct modules are imported and the functions still work as before?

tests added

[erickgalinkin]

These look good -- one further comment: whenever this lands, we'll need to rebase #1214 onto it to pick up some small changes. Or if #1214 lands first, same thing -- we'll need to rebase, since some of these dependencies are scooted around.

[Pouyanpi]

Thank you @jeffreyscarpenter. Would you please install and run pre-commits and also sign your previous commits?

[jeffreyscarpenter]

Thank you @jeffreyscarpenter. Would you please install and run pre-commits and also sign your previous commits?

How does it look now @Pouyanpi?

[github-actions]

Documentation preview

https://nvidia.github.io/NeMo-Guardrails/review/pr-1223

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 68.95%. Comparing base (78e2069) to head (3984041).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../library/jailbreak_detection/model_based/checks.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1223      +/-   ##
===========================================
+ Coverage    68.65%   68.95%   +0.30%     
===========================================
  Files          161      161              
  Lines        15978    15976       -2     
===========================================
+ Hits         10969    11017      +48     
+ Misses        5009     4959      -50     

Flag	Coverage Δ
python	68.95% <85.71%> (+0.30%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../library/jailbreak_detection/model_based/models.py	82.50% <100.00%> (+82.50%)	⬆️
.../library/jailbreak_detection/model_based/checks.py	83.33% <75.00%> (+83.33%)	⬆️

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[Pouyanpi]

Thank you @jeffreyscarpenter for your PR, everything looks good 👍🏻 (I just made some minor changes)