Risk of Overfitting in Weak-to-Strong Fine-Tuning
A significant challenge when viewing weak-to-strong fine-tuning as knowledge distillation is the risk of the stronger model overfitting the weaker model's outputs. This could lead the strong model to simply replicate the weak model's errors and limitations, thereby failing to generalize or solve complex problems that the weak model could not.
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Ch.4 Alignment - Foundations of Large Language Models
Foundations of Large Language Models
Foundations of Large Language Models Course
Computing Sciences
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Risk of Overfitting in Weak-to-Strong Fine-Tuning
A development team is fine-tuning a very large, powerful language model. Instead of using human-labeled data, they use a much smaller, less capable model to generate labels for a vast dataset. The training objective is to make the large model's predictions match the small model's labels as closely as possible, viewing the process as a transfer of 'knowledge' from the small model to the large one. Based on this methodology, what is the most significant potential pitfall?
Example of Successful Weak-to-Strong Generalization: GPT-4 with GPT-2 Supervision
Analyzing the Weak-to-Strong Objective Function
Framing the process of fine-tuning a powerful model with labels from a weaker model as a form of knowledge distillation ensures that the powerful model will automatically learn to generalize beyond the weaker model's capabilities and correct its mistakes.