Efficient Response Generation Method Selection for Fine-Tuning Large Language Models

• URL: http://arxiv.org/abs/2502.11779v1
• Date: Mon, 17 Feb 2025 13:14:11 GMT
• Title: Efficient Response Generation Method Selection for Fine-Tuning Large Language Models
• Authors: Xuan Ren, Qi Chen, Lingqiao Liu,
• Abstract summary: Recent studies have observed that the choice of output variation used in training can affect the model's performance.<n>This paper proposes a scalable, approximate method for estimating the quality of a small subset of generated training data.<n>We show that an LLM trained on data generated by the selected strategy could lead to a significant performance gain.
• Score: 28.717420152590204
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The training data for fine-tuning large language models (LLMs) is typically structured as input-output pairs. However, for many tasks, there can be multiple equally valid output variations for the same input. Recent studies have observed that the choice of output variation used in training can affect the model's performance. This raises an important question: how can we generate the most effective output from the many possible response generation strategy options? Rather than relying on the traditional but resource-intensive train-and-evaluate approach, this paper proposes a scalable, approximate method for estimating the quality of a small subset of generated training data derived from the same input. We then evaluate how well this small subset of generated output fits the target model we are trying to train. We present a large-scale benchmark covering diverse reasoning-based datasets to support our study. The central idea is that a good output should closely resemble the output generated by the target LLM. We formalize this 'closeness' as the expected alignment score between a candidate output and the output sampled from the target LLM. We connect this measurement to the perplexity metric used in previous literature and demonstrate that leveraging an alignment-based metric can provide better predictions of model performance. Using this strategy, we can evaluate a small subset of the generated output from each response generation strategy option, then select the most effective strategy. We show that an LLM trained on data generated by the selected strategy could lead to a significant performance gain in many cases.

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