handle warnings from v5 upgrade

[winglian]

Summary by CodeRabbit

• Chores

  • Updated TRL package dependency to version 0.27.1
  • Adjusted environment variable configuration for performance optimization

• Tests

  • Improved tokenizer fixtures with offline HuggingFace support

• Refactor

  • Reorganized training configuration module structure for better modularity

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates the trl package dependency to version 0.27.1, reorganizes imports to reference CPO, KTO, ORPO, and PRM configurations from trl.experimental submodules, modifies CLI environment variable configuration, and adds offline HuggingFace support to test fixtures.

Changes

Cohort / File(s)	Summary
TRL Dependency Update requirements.txt	Version bump from 0.27.0 to 0.27.1
TRL Imports Reorganization src/axolotl/core/trainers/trl.py, src/axolotl/core/training_args.py	Replaced bulk trl imports with explicit imports from trl and trl.experimental submodules (CPOConfig, KTOConfig, ORPOConfig, PRMConfig now sourced from trl.experimental.*); RewardConfig remains in trl
Environment Variable Configuration src/axolotl/cli/__init__.py	Changed runtime environment variable from HF_HUB_ENABLE_HF_TRANSFER to HF_XET_HIGH_PERFORMANCE in CLI initialization
Test Fixture Configuration tests/prompt_strategies/conftest.py	Added @enable_hf_offline decorator to phi4_tokenizer and qwen3_tokenizer_fixture fixtures for offline HuggingFace usage

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• update trl to 0.18.2 #2814: Modifies trl dependency version in requirements.txt alongside code updates.
• upgrade trl==0.19.1 #2892: Updates trl imports to reference trl.experimental submodules for modularized configuration classes.

Suggested reviewers

• djsaunde
• SalmanMohammadi

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check	❓ Inconclusive	The title 'handle warnings from v5 upgrade' is vague and generic, using non-descriptive terms that don't convey specific information about what changes are actually made in the changeset.	Provide a more specific title that describes the actual changes, such as 'Update TRL imports and environment variables for v0.27.1' or 'Migrate TRL trainer imports to experimental submodules'.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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