fix(pydantic): set allowed values for adapter config

[NanoCode012]

Description

From telemetry, we had users setting this to invalid values. This helps set early validation that we missed

Motivation and Context

How has this been tested?

AI Usage Disclaimer

Screenshots (if appropriate)

Types of changes

Social Handles (Optional)

Summary by CodeRabbit

• Bug Fixes
  • Improved validation for the adapter configuration field to only accept supported types: "lora", "qlora", and "llama-adapter". Previously accepted arbitrary values will now be rejected, preventing invalid configurations.

[coderabbitai]

📝 Walkthrough

Walkthrough

The adapter field type in LoraConfig was narrowed from a generic string to a constrained literal type accepting only "lora", "qlora", or "llama-adapter". The field description was updated to reflect these allowed values.

Changes

Cohort / File(s)	Summary
Type constraint on adapter field src/axolotl/utils/schemas/peft.py	Narrowed LoraConfig.adapter field type from str | None to Literal["lora", "qlora", "llama-adapter"] | None; updated description text to document allowed values.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main
Title check	✅ Passed	The PR title 'fix(pydantic): set allowed values for adapter config' clearly and specifically describes the main change: restricting the adapter field to allowed literal values in the Pydantic schema.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/adapter-typing-pydantic

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

📖 Documentation Preview: https://6992945d2485f04e85919b08--resonant-treacle-0fd729.netlify.app

Deployed on Netlify from commit d6c4241

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!