* feat: add center_rewards_coefficient for reward modeling
- Add center_rewards_coefficient parameter to Pydantic schema with paper reference
- Pass parameter through base builder and causal builder to training args
- Add documentation section with usage examples and theoretical background
- Enable parameter in reward modeling example configs with recommended value
- Enables reward centering for improved training stability in RLHF workflows
Implements auxiliary loss from Eisenstein et al. 2023 (https://huggingface.co/papers/2312.09244)
to incentivize mean-zero reward outputs without post-training normalization.
* Update description
* test: add unit tests for center_rewards_coefficient integration
* Update src/axolotl/core/builders/base.py
Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
* Update docs/reward_modelling.qmd
Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
* Update docs/reward_modelling.qmd
Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
* reference to TRL documentation.
* add new reward model configuration for qwen3 with comprehensive parameters
* Verified center_rewards_coefficient is correctly passed through the trainer builder to training arguments.
* Refactor reward modeling documentation to consolidate information on center_rewards_coefficient
* Remove unit tests for center_rewards_coefficient integration as part of codebase cleanup.
* linting
* nit
* Apply suggestions from code review
Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
* lint
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Co-authored-by: NanoCode012 <kevinvong@rocketmail.com>
Co-authored-by: Salman Mohammadi <salman.mohammadi@outlook.com>
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