Unraveling Direct Alignment Algorithms: A Comparative Study on Optimization Strategies for LLM Alignment

Unraveling Direct Alignment Algorithms: A Comparative Study on Optimization Strategies for LLM Alignment

Aligning AI with Human Values

Aligning large language models (LLMs) with human values is challenging due to unclear goals and complex human intentions. Direct Alignment Algorithms (DAAs) simplify this process by optimizing models directly, without needing reward modeling or reinforcement learning.

How DAAs Work

DAAs use various ranking methods, such as:

  • Comparing pairs of outputs
  • Scoring individual responses

Some DAAs require additional fine-tuning, while others do not. Evaluating their effectiveness is complicated by differences in reward definitions and applications.

Current Methods and Challenges

Traditional methods for aligning LLMs involve multiple complex steps, including:

  • Supervised fine-tuning (SFT)
  • Reward modeling
  • Reinforcement learning

These methods can be costly and complex. DAAs aim to optimize models based directly on human preferences, avoiding the pitfalls of traditional methods.

Improvements in DAAs

To enhance single-stage DAAs like ORPO and ASFT, researchers suggest adding a supervised fine-tuning phase and introducing a scaling parameter (β). This adjustment improves performance, making it comparable to more complex two-stage methods.

Experimental Validation

Researchers tested DAAs using various datasets and found:

  • ORPO and ASFT showed significant improvements with SFT.
  • Adjusting the β parameter led to notable performance increases in different models.

These findings highlight the importance of structured ranking signals for better alignment quality.

Future Directions

The research provides a solid foundation for future studies in model alignment, suggesting that these methods can be applied to larger models with diverse datasets to further refine alignment techniques.

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